Structural engineering of piezocatalysts for piezo-driven H<sub>2</sub>O<sub>2</sub> production: Enabling multifunctional integration in advanced wastewater remediation

Structural engineering of piezocatalysts for piezo-driven H₂O₂ production: Enabling multifunctional integration in advanced wastewater remediation

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Yue Yin^a^,^b, Yaping Fan^a^,^b, Jiao Yang^a^,^b, Yi Ren^c, Bo Lai^d

Chinese Chemical Letters | 2026, 37(10) : 112556

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Chinese Chemical Letters | 2026, 37(10): 112556

• Review •

Structural engineering of piezocatalysts for piezo-driven H₂O₂ production: Enabling multifunctional integration in advanced wastewater remediation

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Yue Yin^a^,^b, Yaping Fan^a^,^b, Jiao Yang^a^,^b, Yi Ren^c, Bo Lai^d

Affiliations

^aSchool of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China

^bHenan International Joint Laboratory of Environment and Resources, Zhengzhou 450001, China

^cState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China

^dState Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China

About Author:

CRediT authorship contribution statement

Yue Yin: Writing – original draft, Methodology, Investigation, Funding acquisition, Formal analysis, Data curation, Conceptualization.

Yaping Fan: Visualization, Validation, Software, Project administration.

Jiao Yang: Writing – review & editing, Software, Methodology, Investigation, Formal analysis, Conceptualization.

Yi Ren: Writing – review & editing, Software, Funding acquisition.

Bo Lai: Writing – review & editing, Supervision, Methodology.

Published: 2026-10-15 doi: 10.1016/j.cclet.2026.112556

Outline

Abstract

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Piezocatalysis based on electrode polarization processes represents a highly promising approach for in-situ H₂O₂ generation. The efficiency of piezocatalytic H₂O₂ generation faces dual constraints from extrinsic operational parameters like excitation frequency and intrinsic material properties, particularly crystallographic characteristics and polarization magnitude governing charge separation kinetics. Consequently, structural optimization targeting enhanced polarization response, accelerated charge transfer, and strengthened reactant adsorption at active sites has become a central research imperative. This review evaluates piezoelectric material design strategies, establishes structure-function relationships spanning multiscale features and H₂O₂ production efficiency, and assesses technological viability for advanced wastewater remediation. By systematically analyzing core structural determinants, including crystal symmetry, heterojunction, surface functionalization, polymerization degree, and microstructural parameters (porosity/thickness), across diverse piezocatalytic systems, we elucidate governing structure-function interdependencies for H₂O₂ production. These determinants have been further validated in material classes spanning perovskites, bismuth-based layered compounds, wurtzite-type materials, transition metal dichalcogenides, carbon-based materials, polymers, metal-organic frameworks, and MAX phase materials. These insights will establish mechanistic foundations for in-situ H₂O₂ synthesis, advancing sustainable water remediation via piezocatalysis.

Key words

Piezocatalysis / H₂O production / Structure-function relationships / Structural engineering / Wastewater remediation

Cite this Article

Yue Yin, Yaping Fan, Jiao Yang, Yi Ren, Bo Lai. Structural engineering of piezocatalysts for piezo-driven H₂O₂ production: Enabling multifunctional integration in advanced wastewater remediation[J]. Chinese Chemical Letters, 2026 , 37 (10) : 112556 - . DOI: 10.1016/j.cclet.2026.112556

Full Text

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1　Introduction

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Hydrogen peroxide (H₂O₂), a carbon-free energy carrier with a high volumetric energy density (5.0 × 10⁶ J/L) [1], has been widely applied in fields such as wastewater treatment [2–4], medical disinfection [5], and chemical synthesis [6–8]. Global H₂O₂ production currently exceeds 4 million tons annually, but its transportation and storage incur significant safety risks [7–9]. Storage-induced autodecomposition further elevates operational costs [10]. Consequently, efficient and environmentally friendly technologies for the in-situ H₂O₂ generation have become a prominent research focus in recent years [11–13].

Piezocatalysis offers a transformative alternative to the energy-intensive anthraquinone process by enabling mild in-situ H₂O₂ generation under ambient conditions, achieving higher turnover frequency through superior electron utilization while eliminating high-pressure reactors and toxic solvents inherent to conventional methods [14]. Pierre et al. first observed pressure-dependent surface charge generation on quartz and tourmaline crystals, noting proportional charge accumulation under mechanical stress and immediate dissipation upon stress removal [15]. This phenomenon, where mechanical deformation induces relative displacement of positive/negative charge centers, generating polarized surface charges and establishing potential gradients, is termed the piezoelectric effect [16]. Recently, piezocatalysis has rapidly advanced by harvesting ambient mechanical energy (e.g., vibrations, hydraulic forces) to activate piezoelectric polarization fields, thereby releasing free charges (electrons/holes) that drive redox reactions [17]. This environmentally compatible strategy circumvents storage-induced autodecomposition through on-site production, empowering critical energy-environment applications including CO₂ reduction [18], water splitting for H₂ evolution [19], and H₂O₂ synthesis [20].

The piezoelectric effect originates from mechanical stress-induced lattice deformation, displacing internal charge centers to generate polarized electric fields [21–23]. Structural anisotropy enables external forces to misalign cation/anion positions, creating dipole moments whose magnitude governs piezoelectric potential strength. Higher polarization intensity yields stronger built-in electric fields that enhance catalytic kinetics [24]. Crucially quantified by the piezoelectric coefficient (d₃₃), Pb(Zr, Ti)O₃ exhibits superior charge generation efficiency (400 pC/N) versus BaTiO₃ (100 pC/N), necessitating greater mechanical energy input for equivalent catalytic efficacy in the latter [25]. Polarization magnitude further correlates with crystal symmetry (e.g., non-centrosymmetric BiFeO₃ below Curie temperature), defect density (oxygen vacancy-optimized BiFeO₃ achieves 110.07 µmol g⁻¹ h⁻¹ H₂O₂) [26], and morphology, where nanostructures amplify responses via elevated surface-area-to-volume ratios and stress concentration [27]. Morphological control is evidenced by ultrathin ZnO/Al₂O₃ (4.5 nm) exhibiting higher surface potential (1.42 V) than ZnAl-LDH (1.23 V) [28], and BaTiO₃ nanowires generating 56-fold greater piezopotential (11.2 V vs. 0.2 V) than nanoparticles under identical stress [29]. These findings demonstrate that multiscale structural engineering plays a decisive role in governing piezoelectric properties.

Through precision engineering of material structure, including crystal structure, microarchitecture, defect configurations, and surface characteristics, the built-in electric fields can be intensified and polarization responses optimized. This synergistic enhancement directly elevates piezocatalytic H₂O₂ generation efficiency. This study focuses on structure-property relationships governing piezoelectric responses across key material classes, correlating structural descriptors with mechano-catalytic performance. And we further interrogate their application in mechano-driven H₂O₂ production for advanced wastewater remediation, with critical emphasis on strain-mediated surface charge redistribution mechanisms that steer oxygen reduction reaction (ORR) and water oxidation reaction (WOR) (Fig. 1). By establishing polarized field-driven piezo-catalytic synergy mechanisms, this work advances functional material design for sustainable H₂O₂ production and in-situ water remediation technologies.

2　Correlation between piezocatalyst structure and H₂O₂ production

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2.1　Impact of catalyst structure on piezocatalytic H₂O₂ production

In piezocatalytic systems, H₂O₂ generation is governed by synergistic interactions between extrinsic operational parameters and intrinsic material properties. As the core determinant, multiscale structural characteristics of piezocatalysts constitute the primary focus of this review. We establish foundational correlations between catalyst architecture and H₂O₂ production performance, specifically examining how interfacial, crystalline, and macroscopic properties dictate functional outcomes. Consequently, elucidating fundamental structure-function relationships, while evaluating practical viability for catalytic H₂O₂ synthesis, emerges as a critical imperative. This section thereby provides the framework for developing high-activity piezocatalysts and designing targeted modification strategies. Detailed analyses of extrinsic parameters including ultrasonic frequency/power, pH, and temperature are comprehensively addressed in Supporting information.

2.1.1　Crystal structure

The crystal structure intrinsically dictates piezoelectric properties, charge separation efficiency, and surface reactivity of materials, directly controlling H₂O₂ production yield and selectivity [30]. Piezoelectric effects exclusively arise in acentric crystal structures. Of the 32 crystallographic point groups, 20 exhibit piezoelectricity due to asymmetric configurations that enable effective charge separation. Crystallographic symmetry critically governs piezoelectric polarization capability and built-in electric field strength, thereby regulating H₂O₂ generation performance [31]. Therefore, modulating crystallographic symmetry consequently offers a promising approach for enhancing piezoelectric functionality.

Elemental doping induces significant lattice distortion and enhances structural asymmetry in piezoelectric materials, offering an effective strategy for performance enhancement. Li et al. synthesized V-doped NaNbO₃ where V-O bond lengths (3.29 Å) closely matched Nb-O lengths (3.33 Å), preserving structural integrity while the slight contraction amplified asymmetry [32]. This yielded enhanced piezoelectric activity, with 10% V-doped NaNbO₃ achieving 102.6 µmol g⁻¹ h⁻¹ H₂O₂ production, which 2.2-fold higher than pristine material. Although hexagonal boron nitride (h-BN) possesses intrinsic Lewis acid-base sites for adsorbing O₂, H₂O, and intermediates, its wide bandgap (5.0–6.0 eV) impedes carrier generation and migration. Moreover, the centrosymmetric structure of bulk h-BN typically suppresses piezocatalytic effects (Fig. 2a) [33]. Ni et al. addressed this through carbon doping, which reduced the valence band maximum from −5.85 eV (h-BN) to −2.65 eV carbon-doped h-BN (h-BCN) [34]. Carbon atoms induced asymmetric electron distribution in h-BCN nanosheets (~140 nm thickness), activating bulk piezocatalytic behavior. Elemental doping simultaneously expands lattice asymmetry through structural distortion and lattice mismatch, while enabling central-site ion substitution that triggers dipole displacement. This synergy enhances piezoelectric polarization, demonstrating that optimized doping levels can strategically boost piezocatalytic activity.

Vacancy engineering further disrupts lattice symmetry, enhances local polarity, and amplifies piezoelectric responses [35]. Oxygen vacancies (OVs) with enriched localized electrons serve as active sites that modulate charge density distribution, thereby reducing the energy barrier for oxygen reduction through enhanced O₂ adsorption and activation [36]. These highly reactive OVs play pivotal roles in catalysis. However, excessive OVs concentrations impair electron transfer efficiency, diminishing H₂O₂ yields. While OVs in BaTiO₃ enhance piezocatalytic activity, a volcanic trend emerges where activity peaks then declines with increasing OVs density (Fig. 2b) [37]. Thus, optimal OVs concentrations must simultaneously provide sufficient O₂ adsorption sites and maintain efficient electron transport pathways. Cai et al. synthesized ultrathin Bi₄O₅Br₂ nanosheets (~5 nm) with tunable OVs concentrations by modulating water/ethylene glycol ratios [38] The synergy between OVs and nanoscale thickness enhanced piezoelectric properties while facilitating charge separation. DFT calculations confirmed OVs significantly improve O₂ adsorption/activation and reduce ΔG barriers in reaction pathways. The OV-optimized nanosheets achieved an exceptional H₂O₂ production rate of 2700 µmol g⁻¹ h⁻¹ in pure water, predominantly via the 2e⁻-ORR pathway. Moreover, vacancy introduction modulates reaction selectivity. Zeng et al. demonstrated that OVs in BiFeO₃ elevate the valence band position, which thermodynamically favors enhanced oxidative capacity and selectively promotes the WOR pathway [26].

Although doping and vacancy engineering enable band structure modulation, excessive incorporation compromises lattice stability [39]. Critically, the quantitative correlation between asymmetric structural modulation and piezoelectric performance remains elusive, with predictive theoretical models for optimal design still lacking. Consequently, integrating machine learning with in-situ characterization techniques becomes essential to optimize materials. This includes exploring multi-field coupling effects (e.g., opto-electro-mechanical synergy) and probing unique piezoelectric behaviors in low-dimensional structures such as nanowires and quantum dots, thereby enhancing H₂O₂ production while ensuring structural sustainability.

2.1.2　Heterojunction

The rapid recombination of electron-hole pairs represents a primary constraint on piezocatalytic efficiency. At heterojunction interfaces, differential band structures, electron affinities, or work functions generate built-in electric fields and band bending that facilitate directional charge transfer, effectively suppressing carrier recombination [40]. Consequently, constructing heterojunctions through coupling piezoelectric materials with semiconductors provides a promising strategy to mitigate this limitation [41].

In piezocatalysis, heterojunctions optimize piezocatalytic charge separation and surface reaction kinetics through interface-induced electric fields (Fig. 2c and d) [42,43]. Zhou et al. engineered a BiOI/BiVO₄ p-n heterojunction featuring an asymmetric interface with a built-in electric field [44]. The piezoresponse of this p-n heterojunction is primarily governed by ultrasonically induced polarization intensity, with further enhancement mediated through the built-in electric field. Ultrasonically enhanced polarization coupled with interfacial fields elevated H₂O₂ production to 480 µmol g⁻¹ h⁻¹, surpassing individual BiVO₄ and BiOI by 1.6-fold and 12-fold, respectively. Besides, integrating piezocatalysis with photocatalysis provides another effective approach to suppress charge recombination. For instance, Pham et al. constructed an S-scheme heterojunction by compositing g-C₃N₄ with CdS, addressing the rapid electron recombination in pristine g-C₃N₄ [45]. The heterostructure attained a H₂O₂ yield of 23.44 µmol g⁻¹ h⁻¹, exceeding the performance of its individual constituents, 11.66 µmol g⁻¹ h⁻¹ for g-C₃N₄ and 19.89 µmol g⁻¹ h⁻¹ for CdS.

Heterojunctions significantly enhance piezocatalytic performance through interfacial engineering, offering distinct advantages. The built-in electric field effectively suppresses electron-hole recombination and improves charge separation efficiency, thereby boosting piezocatalytic activity [46,47]. However, structural characteristics such as heterojunction thickness may compromise piezoelectric response and substrate accessibility. Consequently, balancing the trade-off relationship between these structural features and piezocatalytic efficiency remains an imperative challenge for optimizing heterojunction structures.

2.1.3　Surface functional groups

Surface functional groups critically govern piezocatalytic H₂O₂ production by modulating active sites, activating reactants, and enhancing polarization [48–50]. Zhou et al. validated this principle using carbon-functionalized BiOCl nanosheets [51]. By selectively deactivating C = O, -OH, and -COOH groups with phenylhydrazine, benzoic anhydride, and 2‑bromo-1-phenylethanone blocking agents, they demonstrated that suppressing -OH functionality reduced H₂O₂ yield to levels approaching unmodified BiOCl. This confirmed -OH groups as primary active sites for O₂ activation, while C = O and -COOH deactivation showed negligible impact. Notably, water adsorption-desorption processes share these same active sites. Further mechanistic insights arise from Zhang et al., who employed H₂O-TPD to probe water-catalyst interactions [52]. Ag/BNT-AN exposed enhanced active sites for water adsorption/activation, with reduced surface -OH density indicating improved water oxidation capacity. Complementarily, Jiang et al. synthesized -OH modified SrTiO₃ exhibiting dual functionalities, which surface-attached -OH groups improve hydrophilicity to expose more active sites for water dissociation, while simultaneously generating OVs that trap electrons to facilitate directional charge transfer and suppress recombination (Fig. 3a) [53]. Collectively, these studies suggest that optimal surface -OH density critically balances hydrophilicity, active site accessibility, and piezoelectric charge separation efficiency.

The integration of polar halogen functional groups substantially enhances piezoelectric properties. Chen et al. demonstrated that incorporating highly electronegative fluorine groups (-F) into polymers intensifies piezoelectric responses, where stronger electronegativity correlates directly with amplified built-in electric fields in polymer fibers [54]. Similarly, Wang et al. engineered self-assembled monolayers (SAMs) on Ti₃C₂ surfaces to improve environmental stability and piezocatalytic activity [55]. Surface-modified Ti₃C₂ exhibited altered lattice parameters and symmetry, consequently increasing polarization. Polar SAMs functional groups significantly elevated Ti₃C₂ surface potential, facilitating piezoelectric electron migration. The Ti₃C₂/SAMs-NH₂ configuration achieved optimal performance with 7-fold enhanced BPA degradation efficiency. Halogen functionalities further suppress charge recombination through polarization effects. Electronegative groups such as -Cl induce interfacial polarization upon surface modification, prolonging charge carrier lifetimes. Liu et al. validated this mechanism using Cl-intercalated BiVO₄, where Cl-Bi bonding distorts BiO₆ octahedra [56]. This distortion amplifies structural acentricity under mechanical stress, strengthening intrinsic piezoelectric polarization and piezoresponse.

Furthermore, surface functional group introduction disrupts intrinsic crystallographic symmetry through non-centrosymmetric chemical bonding configurations, inducing lattice distortion and symmetry breaking [57]. These microstructural modifications substantially enhance piezoelectric performance through synergistic mechanisms. Symmetry reduction establishes the fundamental prerequisite for piezoelectric phenomena. And polarization effects from functional groups amplify intrinsic electric dipole moments, elevating piezoelectric coefficients [58]. Therefore, developing piezoelectric materials with tunable polar groups while establishing quantitative models for surface-group-mediated charge shielding and band structure modulation becomes essential for guiding material optimization and predicting catalytic performance.

2.1.4　Pores

Optimally interconnected pores facilitate rapid diffusion of reactants (O₂, H₂O) to active sites while enabling efficient H₂O₂ desorption, thereby mitigating local concentration polarization (Fig. 3b) [59]. Hierarchical pore structures synergistically enhance mass transfer through distinct functionalities: Micropores provide high specific surface area, mesopores stabilize intermediate adsorption, while macropores enable rapid molecular transport. Furthermore, pore edges inherently concentrate lattice defects such as oxygen vacancies, which act as electron-trapping centers that promote piezoelectric charge separation and enhance production efficiency for reactive oxygen species (ROS) including ^•OH and ^•O₂⁻ [60,61].

Elevated porosity substantially increases the specific surface area of materials, exposing more piezoelectric active sites and thereby enhancing H₂O₂ production rates [62]. Garcia et al. fabricated porous ZnO thin films via oblique-angle deposition, achieving a porosity of 9.6% with a piezoelectric coefficient of 115.6 pC/N, which significantly higher than the 11.6 pC/N observed in non-porous ZnO [63]. Hierarchical pore structures similarly optimize catalytic H₂O₂ production. Thomas et al. engineered a hierarchical covalent organic framework (macro-TpBpy) wherein micropores maximize surface area while macropores facilitate substrate transport [64]. This optimized architecture elevated H₂O₂ yield to 2716 µmol g⁻¹ h⁻¹ (27% higher than pristine TpBpy) while effectively suppressing side reactions from localized charge accumulation.

Maximizing specific surface area while preserving mechanical stability necessitates precise pore density regulation. Hierarchical pore systems further optimize catalytic efficiency by synergistically matching mass transfer with reaction kinetics. Surface chemical modifications, through doping or functional group incorporation, additionally fine-tune pore surface hydrophilicity/hydrophobicity. This optimizes H₂O/O₂ adsorption equilibria, critically enhancing catalytic selectivity and operational stability.

2.1.5　Thickness

Lamellar nanomaterials exhibit superior piezoresponse and catalytic activity due to enlarged specific surface areas and amplified stress concentration effects. Thickness modulation optimizes catalytic pathways by tuning bandgap, carrier concentration, and piezoelectric coefficients [65]. Gao et al. demonstrated BaTiO₃ nanosheets achieve 521 µmol g⁻¹ h⁻¹ H₂O₂ production, surpassing particulate BaTiO₃ (167 µmol g⁻¹ h⁻¹) by 3.1-fold [66]. Similarly, in SrBi₂Ta₂O₉ lamellae, predominant (001) plane exposure enhances c-axis polarization, creating internal electric fields that directionally separate carriers while reduced thickness shortens migration paths to suppress recombination [67]. Ultrathin SrBi₂Ta₂O₉ maximizes ultrasonic deformation susceptibility and charge asymmetry, intensifying piezoelectric fields for efficient redox reactions. Moreover, Wang et al. synthesized sub-50 nm MoS₂@MWCNTs nanoflower-tubular hybrids (< 6 nm ultrathin regions) exhibiting 94.4 mV piezoresponse, which was 4.07-fold higher than bulk MoS₂ [68]. Thickness reduction amplifies interlayer polarization, generates stronger built-in fields for charge separation, and expands interlayer spacing to enhance H₂O/O₂ diffusion and confined-space activation [69]. Comparative studies reveal Bi₁₂O₁₇Cl₂ lamellae (~0.95 nm) achieve about 3-fold higher H₂O₂ production than BiOCl (3.4 nm) due to superior mechanical deformation efficiency (Fig. 3c) [70].

Advancing research confirms that material thickness modulates piezoelectric effects through three fundamental mechanisms: Increased surface area, stress sensitivity, and crystallographic polarization. Ultrathin structures enhance carrier separation efficiency, reactant diffusion kinetics, and piezo-electronic coupling via intensified mechanical deformation. Emerging thickness-control techniques and emergent 2D heterostructures promise enhanced dynamic responsiveness and operational stability, extending piezocatalytic applications to environmental remediation, energy conversion, and biomedical engineering. Through multiscale structural design and mechanistic innovation, piezocatalysis may pioneer new pathways for green chemistry and sustainable energy technologies.

2.1.6　Degree of polymerization

The degree of polymerization (DP) primarily influences piezoelectric properties indirectly through its effects on crystallization behavior, chain segment mobility, and processability, rather than directly determining piezoelectric coefficients (e.g., d₃₃). Compared to crystallinity, molecular polarity, and compositing strategies, DP optimization remains secondary. For polyvinylidene difluoride (PVDF), piezoelectric enhancement relies more critically on β-phase content (achieved through stretching or annealing) than on DP elevation alone (Fig. 3d) [71]. The β-phase adopts an all-trans conformation with highly ordered molecular chain alignment, enabling significant electric dipole moment variations under mechanical stress [72]. While higher DP may promote ordered packing that increases β-phase content, excessive DP induces chain entanglement that impedes crystallization [73]. Thus, DP must balance "sufficient length for structural ordering" against "excessive entanglement avoidance". Furthermore, polymer piezoelectric require molecular chain orientation via stretching or electric poling to enhance cooperative dipole alignment. Longer chains (higher DP) may facilitate highly oriented structures during stretching, but excessively high DP increases material brittleness, compromising processability [74]. This stems partly from DP's impact on copolymer segment distribution homogeneity or filler dispersion. Ultimately, DP must exceed a critical threshold to enable ordered structure formation, but its influence plateaus beyond this threshold due to asymptotic saturation effects.

In PVDF film research, DP typically adheres to industry standards, with emphasis placed on β-phase induction and poling methodologies. Functioning as an indirect modulator, DP necessitates synergistic calibration with primary performance determinants, notably crystallinity control and poling processes. Consequently, material design prioritizes crystallization kinetics, molecular polarization alignment, and composite formulation strategies, whereas DP selection primarily addresses processing feasibility and mechanical robustness.

2.2　Correlation between catalyst types and piezocatalytic H₂O₂ generation performance

Building upon the aforementioned structural characteristics, this section systematically summarizes piezoelectric catalytic H₂O₂ production across diverse material systems, including perovskites, bismuth-based layered compounds, wurtzite-type materials, transition metal dichalcogenides (TMDCs), carbon-based materials, polymers, metal-organic frameworks (MOFs), and MAX phase materials. And the performance variations in piezocatalytic H₂O₂ production across distinct catalyst systems are listed in Table S1 (Supporting information).

2.2.1　Perovskite

Perovskite oxide materials, composed of metal cations and oxygen anions, adopt the general formula ABO₃ with a cubic symmetric crystal structure as the fundamental unit [75]. The perovskite framework accommodates diverse cationic dopants, enabling symmetry modification for enhanced piezoelectric properties [76]. ATiO₃-type perovskites, including PbTiO₃ [77], BaTiO₃ [78], and SrTiO₃ [79], are widely employed in piezocatalysis. In BaTiO₃, Ti atoms occupy octahedral centers coordinated by six O atoms, while Ba resides at unit cell corners. Polarization arises from relative displacements between Ti⁴⁺ and O²⁻, with non-centrosymmetric tetragonal BaTiO₃ exhibiting substantially higher polarization along the [001] direction than its cubic phase.

Significant compositional flexibility at A/B sites permits tailored modifications of crystal structure, redox activity, and oxygen vacancy concentration through metal ion substitution [80,81]. Controlled doping fine-tunes piezoelectric coefficients within specific ranges, offering critical advantages for piezocatalytic applications. Hou et al. synthesized double-perovskite piezocatalysts Ba₂Nb₂₋_xFe_xO₆. In Ba₂Nb₂₋_xFe_xO₆, Fe incorporation breaks cubic symmetry to promote tetragonal phase evolution, generating intrinsic piezoelectricity, while simultaneously modulating physicochemical properties by narrowing bandgap, enhancing electronic conductivity, and increasing charge carrier density and defect concentration. This synergy enables dual-pathway H₂O₂ generation via WOR and ORR under O₂-saturated conditions, achieving 690 µmol g⁻¹ h⁻¹ yield.

Morphological engineering also effectively optimizes piezoelectric performance in perovskites. Conventionally structured (K, Na)NbO₃ exhibits limited piezocatalytic activity due to sparse active sites. To address this, Wang et al. implemented a morphology-control approach utilizing high-energy pendulum ball milling instead of conventional ball milling to deliberately create uneven raw material distribution, synthesizing (K, Na)NbO₃ catalysts with stepped-surface morphology [82]. This configuration enhances edge exposure and active site density, significantly boosting piezocatalytic activity. While larger particles exhibit diminished quantum size effects, their dispersibility optimizes piezoelectric utilization, enabling exceptional micron-scale catalytic performance. Gao et al. reported piezocatalytic H₂O₂ production rates of 167, 521, and 1088 µmol g⁻¹ h⁻¹ for BaTiO₃ powder, single-crystal nanosheets, and Ag-decorated nanosheets, respectively (Fig. 4a) [66]. The enhanced performance of Ag-decorated systems stems from interfacial electron enrichment at metal-semiconductor junctions. This phenomenon strengthens O₂ adsorption, increases catalytic active sites, and boosts ^•O₂⁻ generation, ultimately accelerating H₂O₂ production kinetics.

Surface modification also holds significant importance for enhancing piezocatalytic performance. Zhang et al. strategically integrated piezoelectric enhancement and surface engineering to optimize piezocatalytic H₂O₂ production over Bi_0.5Na_0.5TiO₃ (BNT) [52]. Their approach produced Ag-decorated Bi_0.5Na_0.5TiO₃-AgNbO₃ solid solution (Ag/BNT-AN), a highly stable catalyst for dual-pathway H₂O₂ generation. Concurrent piezoelectric improvement via Ag/BNT-AN co-substitution and synergistic ORR/WOR promotion through Ag nanomaterials with hydroxyl surface modification substantially amplified piezocatalytic activity. Under ultrasonication, Ag/BNT-AN achieved an H₂O₂ production rate of 469 µmol g⁻¹ h⁻¹, representing a 13-fold increase over pristine BNT.

Enhancement strategies for perovskite piezocatalysts center on synergistic compositional engineering and morphological control. Specifically, strategic adjustment of A/B-site elements and dopants optimizes crystallographic symmetry and piezoelectric coefficients, thereby amplifying mechanical stress-induced charge polarization. Moreover, directional synthesis of nanoflakes or nanowires shortens charge migration pathways while exposing abundant active sites through high specific surface areas. Complementarily, composite fabrication exploits low-energy charge-transfer barriers at interfaces to facilitate electron-hole separation, with interfacial piezoelectronic coupling further enhancing localized charge density.

2.2.2　Bismuth-based layered compounds

Bismuth-based layered materials, including BiOX (X = I, Br, Cl), Bi₄O₄Br₂, Bi₂WO₆, BiOClO₃, Bi₁₂O₁₅Cl₆, constitute a prominent class of piezoelectric materials [83]. These crystals feature an ordered layered structure formed by the alternating stacking of tetragonal (Bi₂O₂)²⁺ layers with halide ions, perovskite-like (A_n-1B_nO_3n+1) slabs, or intercalated ions (e.g., CO₃²⁻, BO₃³⁻, NO₃⁻) along the c-axis (Figs. 4b and c) [51,84]. Ionic groups or interlayer ions reside at the central positions between adjacent (Bi₂O₂)²⁺ layers.

This structural ordering enables efficient internal electric field generation under mechanical stress, facilitating effective charge separation [85]. Wang et al. synthesized ultrathin Bi₄Ti₃O₁₂, which exhibits a strong piezoelectric response due to the off-center displacement of Ti⁴⁺ ions within TiO₆ octahedral units [83]. This piezoelectric response intensifies with diminishing thickness, as evidenced by a d₃₃ of 183.43 pm/V and H₂O₂ production rate of 161.12 µmol g⁻¹ h⁻¹ for 4.2-nm-thick nanosheets, while 25.8-nm-thick counterparts show reduced values of 69.75 pm/V and 86.48 µmol g⁻¹ h⁻¹. Separately, Cai et al. reported efficient piezocatalytic H₂O₂ generation in pure water using ultrathin Bi₄O₅Br₂ nanosheets (~5 nm) [38]. The ultrathin nanostructure simultaneously enhances piezoelectric polarization and promotes stress-driven charge separation. Concurrently, oxygen vacancies at nanosheet edges improve O₂ adsorption/activation and significantly reduce the ΔG barrier for reaction pathways, achieving an exceptional H₂O₂ yield of 620 µmol g⁻¹ h⁻¹.

The inherent polarization of bismuth-based layered compounds enables efficient charge carrier separation under mechanical stress through their two-dimensional architecture. Moreover, ultrathin configurations expose abundant active sites, while strategically introduced oxygen vacancies significantly enhance piezocatalytic H₂O₂ generation performance.

2.2.3　Wurtzite-type materials

Wurtzite-type structures crystallize in a hexagonal system where anions (e.g., S²⁻, O²⁻) adopt a hexagonal close-packed (hcp) arrangement, with cations (e.g., Zn²⁺) occupying tetrahedral interstices within the anion sublattice (Fig. 4d) [86]. At ambient conditions, ZnO adopts the hexagonal wurtzite structure (space group P6₃mc), belonging to the 6 mm point group. Each Zn²⁺ ion resides in tetrahedral coordination with O²⁻ ions, forming Zn-O₄ tetrahedra. This non-centrosymmetric structure enables mechanical stress to displace Zn²⁺ cations relative to O²⁻ anions, disrupting charge equilibrium and generating dipole realignment. Consequently, spontaneous polarization develops along the c-axis [87].

Bulk ZnO exhibits a d₃₃ of 9.9 pm/V, while studies confirm that reduced crystal dimensions significantly enhance d₃₃ [88]. For instance, c-axis-oriented ZnO films achieve d₃₃ = 12.5 pm/V at 1 µm thickness, whereas 60-nm-thick ZnO nanoribbons exceed 25 pm/V [89]. Mahmood et al. synthesized large-area, nanometer-thick ZnO sheets via a liquid-metal-based approach [90]. These ultrathin ZnO sheets (hundreds of micrometers wide) maintain stable crystallinity and hexagonal phase purity, with 1.1-nm-thick samples reaching d₃₃ = 80 pm/V, approximately 8-fold higher than bulk ZnO. Similarly, Nie et al. fabricated 4.5-nm-thick ZnO/Al₂O₃ composites by calcining Zn-Al LDH precursors [28]. The ultrathin composites demonstrate enhanced piezopotentials through facile bending deformation. Supporting this observation, COMSOL finite element simulations reveal lateral surface potential differences reaching 1.42 V for 5-nm ZnO models compared with 1.23 V for 20-nm structures under equivalent deformation, corroborating superior piezoelectric induction in thinner structure.

Furthermore, metal doping significantly enhances piezoelectric coefficients in zinc oxide by modifying crystallographic symmetry. Pan et al. synthesized high-piezoelectric-coefficient ZnO doped with Fe³⁺ (d₃₃ = 127 pm/V), Cr³⁺ (d₃₃ = 120 pm/V), and V⁵⁺ (d₃₃ = 110 pm/V) [91–93]. Similarly, Chen et al. fabricated MgxZn₁₋_xO thin films via Mg²⁺ doping, achieving a d₃₃ value of 54.1 pm/V [94], and Sinha et al. documented d₃₃ values of 30, 43, 45, and 101 pm/V for Ce³⁺-, Eu³⁺-, Gd³⁺-, and La³⁺-doped ZnO nanorods, respectively [95–97]. Doping further amplifies piezoresponse through morphological control. Undoped ZnO nanoparticles form 1D pencil-like nanorods or 2D nanosheets. Sinha et al. demonstrated that Y³⁺ doping induces a phase transition from 1D nanorods to 2D nanosheets [98]. The resulting Y-ZnO nanosheets exhibit an exceptional d₃₃ of 420 pm/V, attributed to enhanced Y-O bond polarity versus Zn-O bonds. This promotes easier c-axis rotation under electric fields, substantially amplifying piezoelectric response.

Despite the dual functionality of ZnO as a piezoelectric and photocatalytic semiconductor, its piezocatalytic H₂O₂ production faces challenges from rapid recombination of piezopolarization charges. Rational catalytic site design for segregated e⁻ and h⁺ transfer is essential to suppress disordered charge migration and active-site competition. Constructing metal-semiconductor Schottky heterojunction can deplete excess electrons in piezoelectrics, mitigating internal piezopotential screening [99]. For instance, Wen et al. engineered an Au–ZnO Schottky heterojunction for piezophotocatalytic H₂O₂ synthesis, facilitating dual ORR/WOR pathways [100]. This configuration achieved 186 µmol/L H₂O₂ in pure water within 30 min, where reduction reactions exclusively localized to Au sites while oxidation reactions occurred at ZnO domains. This spatial isolation of active sites suppresses competitive adsorption, thereby facilitating synergistic coupling of oxidation–reduction processes.

Morphological engineering, metal/nonmetal doping, defect engineering, and heterostructure construction constitute effective strategies for optimizing the piezocatalytic performance of ZnO. Morphological control enhances built-in electric fields and elevates piezoelectric coefficients through tailored nanostructures. Doping strategies enhance polarization levels and boost active site density, while defect engineering strengthens reactant adsorption and activation through strategically introduced vacancies. Heterojunctions facilitate charge separation by establishing interfacial built-in electric fields. Future efforts should integrate multidimensional synergy among these strategies while leveraging piezo-photocatalytic coupling to advance H₂O₂ production efficiency.

Optimizing ZnO piezocatalytic performance necessitates synergistic integration of morphological engineering, metal/nonmetal doping, defect engineering, and heterostructure construction. Morphological control elevates piezoelectric coefficients by intensifying built-in electric fields through nanostructural tailoring, while doping strategies enhance polarization levels and active site density. Moreover, defect engineering strengthens reactant adsorption and activation via controlled vacancy generation. Concurrently, heterojunctions facilitate charge separation through interfacial built-in fields. Leveraging multidimensional synergistic interactions among these approaches, complemented by external assistance mechanisms such as piezoelectric photocatalysis, is poised to substantially advance H₂O₂ production.

2.2.4　Transition metal dichalcogenides

Transition metal dichalcogenides (TMDCs) consist of transition metal atoms (e.g., Mo, W, Nb, Ta) bonded to chalcogen atoms (S, Se, Te) in stacked layered configurations (X − M − X), where M denotes the metal and X the chalcogen [101]. This stratified structure enables interlayer slippage or deformation under mechanical stress, thereby generating piezoelectric responses [102]. When transitioning from multilayer to monolayer, TMCDs undergo significant band structure transformations, such as indirect-to-direct bandgap transitions, thereby critically modulating piezoelectric properties.

Within TMDC materials systems, reducing dimensionality enhances piezoelectric performance. Monolayer TMDCs exhibit pronounced piezoelectric responses due to synergistic effects of reduced thickness and weakened interlayer coupling, which amplify lattice distortion [103]. Wang et al. experimentally demonstrated that thin MoS₂ flakes with odd-numbered atomic layers generate measurable piezoelectric voltage and current outputs during cyclic stretching/release, whereas even-layered and bulk MoS₂ exhibit negligible response [104]. MoS₂ nanosheets possess asymmetric odd-layer configurations, high electrical conductivity, abundant active edge sites, strong piezoelectric response, and large surface area (Fig. 4e) [105]. Monolayer MoS₂ adopts a S–Mo–S sandwich structure with a thickness of 0.62 nm, exhibiting a piezoelectric coefficient of 3.06 pm/V [106]. Intralayer Mo–S covalent bonds provide structural rigidity, while adjacent layers interact via weak van der Waals forces. In unstrained configurations, charge centroids coincide yielding zero net dipole moments. Under tensile strain, elongated Mo-S dipoles expand the unit cell, consequently inducing spontaneous polarization from S to Mo atoms. Conversely, compressive strain reverses polarization direction. The collective dipole realignment establishes an ordered unidirectional field parallel to the applied force. This polarization field drives efficient charge separation, migrating free carriers to material surfaces where they trigger redox reactions [107].

The piezocatalytic activity of TMDCs exhibits strong phase dependence across crystalline structures, 1T (trigonal), 2H (hexagonal), and 3R (rhombohedral). Notably, 2H-WS₂ demonstrates markedly higher activity than its 1T counterpart due to non-centrosymmetric symmetry, whereas the latter's centrosymmetry suppresses piezoelectricity [108]. However, while piezocatalysis relies on both layer thickness and phase structure, the high-activity 2H phase typically forms in multilayers/bulk configurations where diminished surface-area-to-volume ratios limit efficacy. Synthesizing few-layer 2H-dominant WS₂ and analogous TMDCs thus remains challenging. Meng et al. addressed this limitation through magnetic-induction-heated synthesis of Fe-doped WS₂ (Fe/WS₂) monolayers with enriched 2H phase [109]. Under 30 kHz ultrasound, Fe/WS₂ achieved 4680 µmol g⁻¹ h⁻¹ H₂O₂ production via selective ORR, a 47-fold enhancement over pristine WS₂.

The distinctive layered architecture of TMDCs delivers high specific surface areas and abundant active sites, as confirmed by recent research. Critically, piezoelectricity-induced built-in electric fields enable efficient charge carrier separation, positioning TMDCs as highly promising materials for piezocatalytic applications including H₂O₂ synthesis and pollutant degradation. To maximize catalytic performance, precise regulation of layer count and crystalline phase becomes essential, maximizing edge-site exposure while synergistically coupling the metallic conductivity of 1T phases with the intrinsic activity of 2H phases. This fundamental optimization must be coupled with in-situ characterization to establish explicit structure-function relationships, correlating layer thickness, phase composition, and piezoelectric response to propel rational design of advanced piezocatalysts.

2.2.5　Carbon-based materials

Graphitic carbon nitride (g-C₃N₄), a layered carbon-based catalyst, has gained significant attention in electrochemical applications due to its excellent conductivity and stability [110–113]. Its structure comprises s-triazine units interconnected via amino groups or nitrogen bridges, forming stratified layers. Three s-triazine units covalently link to create heptazine rings (C₆N₇). Periodic arrangement of these rings in 2D planes generates geometrically constrained triangular cavities [114]. Although bulk g-C₃N₄ is centrosymmetric, these cavities disrupt local symmetry, enabling strain-induced charge separation (flexoelectric effect). Meanwhile, stress-induced dipole realignment at cavity-edge polar bonds confers piezoelectricity. Both effects are synergistically amplified by uniform cavity distribution [115]. While pristine g-C₃N₄ exhibits an in-plane piezoelectric coefficient of only 10 pm/V, strategies such as morphological engineering, vacancy construction, and elemental doping will significantly enhance its piezoresponse [116].

Morphological engineering optimizes energy absorption pathways, enabling piezocatalysts to achieve greater deformation under identical mechanical energy input. Enhanced strain sensitivity promotes piezoelectric charge generation and catalytic efficiency [69]. For instance, Wang et al. synthesized diverse g-C₃N₄ structures, hollow nanotubes (d₃₃ = 34.99 pm/V), nanosheets (d₃₃ = 14.44 pm/V), and nanospheres (d₃₃ = 12.21 pm/V) [117]. Under ultrasound, hollow nanotubes achieved 262 µmol g⁻¹ h⁻¹ H₂O₂ production, surpassing nanosheets and nanospheres by 1.5-fold and 6.2-fold, respectively. Concurrently, vacancy engineering enhances structural asymmetry and charge separation. Fu et al. engineered oxygen-doped, nitrogen-deficient C₃N₅₋_x-O piezocatalysts (Fig. 5a) [118], where dual defects (O-doping + N-vacancies) amplify asymmetry, expose triangular cavities, optimize band structures, and redistribute charges in ultrathin layers. This synergistic modulation enhanced piezoelectricity and active surface area, achieving 615 µmol g⁻¹ h⁻¹ H₂O₂ yield in pure water, a 6-fold increase over pristine g-C₃N₄.

Moreover, strategic incorporation of functional groups effectively enhances piezoelectric response and consequently optimizes electron transfer efficiency. Fu et al. engineered cyano groups (–C≡N) and nitrogen vacancies into C₃N₅, creating C₃N₅₋_x-CN with synergistic piezoelectric-photoelectric enhancement [119]. Critically, dual-defect sites amplified piezoelectricity and promoted charge carrier separation, boosting the piezo-photocatalytic H₂O₂ yield to 1359 µmol g⁻¹ h⁻¹ in pure water. Beyond vacancy engineering, perylene diimide (PDI), characterized by a rigid π-conjugated plane, represents a highly promising modifier for g-C₃N₄ [120]. Through its aromatic plane, PDI enhances π-π stacking with triazine rings while concurrently inducing planar distortion in layered g-C₃N₄, substantially amplifying polarization and boosting piezoelectric response [121]. Tang et al. demonstrated that PDI incorporation reinforces π–π interactions (facilitating electron migration) while distorting g-C₃N₄ layers into polar porous structures, achieving 149.8 µmol g⁻¹ h⁻¹ piezocatalytic H₂O₂ (twice the photocatalytic yield). Piezo-photocatalytic synergy further elevated production to 625.54 µmol g⁻¹ h⁻¹ [122].

Carbon-based piezoelectric catalysts demonstrate superior stability and durability in complex pH environments compared to metal-based counterparts, effectively mitigating environmental risks associated with heavy metal ion leaching. Their intrinsic metal-free nature offers compelling advantages in eco-compatibility and sustainability while simultaneously reducing material costs and long-term ecotoxicity risks. Nevertheless, the piezocatalytic performance of carbon-based materials remains underexploited due to inherent limitations: The scarcity of non-centrosymmetric crystal structures and suboptimal piezoelectric polarization responses. Targeted catalyst design requires synergistic integration of structural engineering through defect manipulation (vacancies/edge sites) and heteroatom doping (N/B/P) to modulate electron distribution, simultaneously incorporating porous/hierarchical architectures for enhanced strain sensitivity. This foundational approach must be coupled with polarization optimization via electric poling or interfacial engineering using polar materials to directionally align dipoles, thereby enabling multi-field synergy where optical, thermal, and ultrasonic energies collectively amplify piezoresponse. Ultimately, computational modeling and in-situ characterization are essential to establish explicit structure-function relationships for precision-engineered catalyst development.

2.2.6　Polymers

The piezoelectricity of polymeric materials primarily originates from either spontaneously polarized ferroelectric phases or crystalline phases with asymmetric centers [123]. Enhanced piezoelectric performance is achieved by reorienting randomly aligned dipoles within polymer crystals through processing techniques, notably mechanical stretching or thermal/electrical poling under DC fields, thereby optimizing dipole alignment [71]. Ultimately, variations in piezoelectric response across polymeric systems are governed by disparities in molecular asymmetry and orientation fidelity [124].

PVDF exhibits five crystalline phases (α, β, γ, δ, ε), with the β-phase demonstrating superior polarity. Controlling β-phase content and crystalline orientation is therefore critical for fabricating high-performance PVDF piezoelectric/ferroelectric materials [125]. Meng et al. enhanced β-phase content and electrical conductivity by incorporating conductive polyaniline (PANI) into PVDF, synthesizing novel PANI/β-PVDF microspheres. The pristine PVDF powder exhibited the lowest piezoelectric coefficient (d₃₃ = 0.29 × 10⁻¹¹ C/N), while β-PVDF showed an 89.3% increase in d₃₃. After PANI incorporation, d₃₃ further rose to 3.50 × 10⁻¹¹ C/N. These PANI/β-PVDF microspheres achieved exceptional piezocatalytic efficiency, degrading 98.1% levofloxacin within 30 min.

PTFE exhibits significant potential as a piezocatalytic material for H₂O₂ generation. Wang et al. ultrasonicated PTFE stirring bars in aqueous media for 2 h, achieving H₂O₂ concentrations of 514.2 µmol/L [126]. The mechanism initiates with electrons transfer from oxygen atoms of water molecules to the LUMO sites of PTFE, generating negatively charged PTFE species (PTFE(e⁻)) and positively charged water radical cations (H₂O^•+). PTFE(e⁻) reduces O₂ to form ^•O₂⁻ (the precursor for H₂O₂), while H₂O^•+ undergoes proton transfer with neutral H₂O to yield ^•OH and hydronium ions (H₃O⁺). Ultimately, ^•OH radicals recombine to produce additional H₂O₂. Critically, intense interfacial electric fields generated by polarized C-F bonds during piezocatalysis reduce reaction activation energies. Compared to dielectrics like polyethylene (PE) and polyvinyl chloride (PVC), fluorinated polymers (FEP/PTFE) exhibit higher charge densities in contact-separation processes, producing stronger interfacial fields. However, inherent hydrophobicity limits aqueous dispersion and active site accessibility. To overcome this, Li et al. synthesized hydrophilic PTFE/ZSM-5 composites with uniform PTFE dispersion (Fig. 5b) [127], achieving an exceptional H₂O₂ production rate of 1978.8 µmol g⁻¹ h⁻¹.

The piezoelectricity of polymeric materials originates from intrinsically polarized ferroelectric phases or asymmetric crystalline structures (e.g., β-phase PVDF). Performance optimization requires dipole alignment through mechanical stretching or electric poling. Specifically, for PVDF, its β-phase, exhibiting the strongest polarity, serves as the cornerstone for high-performance applications. Compositing with conductive polymers (e.g., polyaniline) synergistically enhances β-phase content and electrical conductivity. Thus, novel polarization techniques (electric field/strain co-modulation) and additives (nanofillers/ionic liquids) can directionally induce β-phase formation and optimize molecular alignment, significantly amplifying piezoresponse. Meanwhile, PTFE demonstrates high piezocatalytic potential for H₂O₂ generation via strong interfacial electric fields from polarized C-F bonds. However, inherent hydrophobicity restricts dispersion and active-site accessibility. Addressing this necessitates functionalized carriers (porous oxides/carbon matrices) or surface modifications to balance hydrophilicity and interfacial charge enrichment. Furthermore, flexible heterojunctions (e.g., PVDF/PTFE membranes) leverage synergistic polarization to augment catalytic efficiency. Collectively, multiscale structural engineering enables piezoelectric polymers to transcend inorganic material limitations, positioning them as core candidates for green catalysis and intelligent responsive technologies.

2.2.7　Metal organic frameworks

Metal organic frameworks (MOFs) are crystalline materials comprising metal ions/clusters interconnected by organic linkers, featuring high porosity and large specific surface areas [128–130]. Compared to conventional piezocatalysts, MOFs exhibit enhanced piezocatalytic activity and charge separation efficiency due to their polar functional groups and asymmetric structural units [131]. Huang et al. synthesized an aluminum-based MOF (NH₂−MIL-101(Al)) demonstrating a significant piezoelectric response (18.2 nm/V) under mechanical stress [132]. Ultrasonication induces structural distortion in NH₂−MIL-101(Al), generating bound charge polarization via displacement of positive/negative charge centers. This creates a polarized electric field that drives directional charge carrier migration, achieving an exceptional H₂O₂ production rate of 8890 µmol g⁻¹ h⁻¹. Moreover, Li et al. developed a sea-urchin-like Zn-MOF-74@g-C₃N₄ composite through epitaxial growth of g-C₃N₄ nanoneedles on spherical Zn-MOF-74 substrates (Fig. 5c) [133]. This unique architecture leverages high-curvature needle tips to generate a lightning-rod effect that directs electron migration along the axial direction, thereby accelerating surface charge separation, while the established S-scheme heterojunction concurrently enhances bulk charge separation. Critically, coupling piezoelectric polarization with interfacial electric fields suppresses both surface and bulk charge recombination, significantly boosting charge transfer efficiency. Under combined piezocatalysis and photocatalysis, the composite achieved an H₂O₂ production rate of 697 µmol g⁻¹ h⁻¹, surpassing pristine g-C₃N₄ and Zn-MOF-74 by 5.0- and 5.4-fold respectively. This performance stems from polarization-field synergy, which enhances charge carrier mobility and maximizes photogenerated electron/hole flux to catalytic surfaces and reactive interfaces, thus accelerating reaction kinetics and elevating H₂O₂ yield.

While conventional piezoelectric materials predominantly consist of inorganic ceramics or polymers, the piezoelectric properties of MOFs have garnered significant attention only in recent years. Their piezoelectric performance relies on non-centrosymmetric structures formed between metal clusters and organic linkers, but most MOFs exhibit high crystallographic symmetry that impedes spontaneous polarization. Through rational engineering of structural polarization, developing novel MOF-based materials as state-of-the-art piezocatalysts holds substantial practical potential for H₂O₂ generation across complex environmental conditions. Therefore, strategic enhancement of MOF piezocatalysts involves coupling MOFs with conductive substrates (e.g., MXenes) or 2D nanosheets to augment charge transport efficiency and electrical conductivity, while simultaneously incorporating metal nanoparticles (Au, Pt) or functionalized ligands to optimize O₂ adsorption kinetics and refine electron transfer dynamics.

2.2.8　MAX phase materials

MAX phase materials, as emerging layered ternary compounds, have demonstrated unique potential in piezoelectric properties and catalytic applications. Their crystal structure features alternating stacks of M_n₊₁X_n layers and A-element layers, with this non-centrosymmetric layered configuration enabling intrinsic piezoelectric responses [134]. Piezoelectric effects typically rely on crystallographic non-centrosymmetry, and the low-symmetry layered arrangement of MAX phases facilitates separation of positive/negative charge centers under mechanical stress, generating polarized electric fields [135]. Jia et al. systematically investigated MAX phases (e.g., Ti₃AlC₂, Ti₃AlCN, Ti₃SiC₂) for piezocatalytic H₂O₂ production (Fig. 5d) [136]. The results demonstrate that Ti₃SiC₂ achieved the maximal H₂O₂ production rate of 871.0 µmol g⁻¹ h⁻¹ in pure water, surpassing the performance of predominant piezocatalysts. Besides, Tan et al. reported experimental evidence of piezoelectricity in monolayer Ti₃C₂T_x MXene [48]. Surface functional groups (T_x) break crystal symmetry, endowing piezoelectricity. Under 1.08% tensile strain, Ti₃C₂T_x generated an intrinsic piezoelectric current of 0.3 nA, with a power density of 6.5 mW/m² and conversion efficiency of 11.15%, exceeding all reported 2D materials.

Despite limited experimental data on MAX phase piezoelectricity in current literature, their unique combination of metallic conductivity and ceramic-like mechanical properties (e.g., high hardness, thermal stability) may enable exceptional charge carrier transport pathways and structural robustness for piezocatalysis. Surface modification of A-site atoms (e.g., Al, Sn) could enhance adsorption of O₂ or H₂O. Integrating MAX phases as reinforcing phases with semiconductors (e.g., g-C₃N₄) may modulate interfacial electric fields to optimize charge separation efficiency, offering novel strategies for composite design. Furthermore, one-dimensional MAX phase nanofibers, with high specific surface area and mechanical flexibility, could improve stress responsiveness and active site distribution in piezocatalytic reactions. Although research on MAX phases in piezocatalysis remains nascent, their structural tunability, electrical conductivity, and mechanical stability provide distinct advantages for efficient H₂O₂ production. Future advancements require synergistic efforts in material design (e.g., dimensionality engineering, surface functionalization) and mechanistic studies (e.g., polarization response optimization, catalytic pathway refinement) to unlock their potential in green energy initiatives and environmental remediation.

3　Applications of piezocatalytic in wastewater remediation

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3.1　Oxidation of organic pollutants

Piezocatalytic H₂O₂ production overcomes limitations of traditional synthesis by offering a green, low-energy alternative for wastewater treatment. These systems leverage dual pollutant degradation mechanisms through direct oxidation coupled with synergistic activation [137]. Mechanical stress induces piezoelectric polarization to generate built-in electric fields that simultaneously drive H₂O₂ production and micropollutant degradation (Fig. 6a) [138,139]. For example, hydroxyapatite demonstrates representative 2e⁻-ORR behavior where ultrasonication dissociates adsorbed water/hydroxide ions to release electrons enabling sequential single-electron transfers for H₂O₂ generation, subsequently driving efficient micropollutant degradation [140]. Complementarily, Peng et al. developed Bi₃O(PO₄)₂OH microcrystals where enhanced -OH group asymmetry amplifies piezoelectric responses in phosphate units [141]. This dual-pathway system (2e⁻-ORR + 2e⁻-WOR) achieved 639.11 µmol g⁻¹ h⁻¹ H₂O₂ yield under mild ultrasound (80 W, 40 kHz), with degrading 0.6 mg/L atrazine within 20 min.

Beyond direct organic oxidation by H₂O₂, hole-mediated oxidation constitutes a complementary degradation pathway. Wang et al. revealed that during hole-electron separation, h⁺ generated at Fe₂(MoO₄)₃ heterojunctions could oxidatively degrade electron-rich pollutants (e.g., bisphenol A, phenytoin, ciprofloxacin), underscoring the necessity of enhancing h⁺ concentration for efficient oxidant development targeting micropollutant degradation [142]. Similarly, electrochemically hydrogenated MoO₃ nanoparticles exhibit a narrowed bandgap that facilitates h⁺ generation, resulting in H-MoO₃ with enhanced degradation efficiency for antibiotics [143]. Moreover, coupling piezoelectric catalysis with photocatalysis simultaneously enhances charge carrier separation through mechanical stress and photoexcitation, thereby boosting both H₂O₂ production and pollutant oxidation efficiency. The piezoelectric effect harnesses mechanical vibration energy to generate a polarized electric field that accelerates the separation and migration of photogenerated electron-hole pairs while suppressing recombination [144]. Demonstrating this synergy, Lv et al. employed BiVO₄ and Ag-decorated ZnO@PVDF nanofibers for piezo-photocatalytic ROS generation (H₂O₂, ^•O₂⁻, ^•OH), achieving 147.7 µmol H₂O₂ production in 90 min with concurrent 95% pefloxacin degradation within 30 min (Fig. 6b) [145]. Besides, Fu et al. introduced cyano groups (-CN) and N vacancies into semiconductor C₃N₅, successfully synthesizing an efficient piezo-photocatalyst (C₃N₅₋_x-CN) with enhanced piezo-photocatalytic performance [119]. The prepared C₃N₅₋_x-CN exhibited synergistic enhancement of piezoelectricity and photoelectricity in an ultrasound-assisted photocatalytic system, producing H₂O₂ at a rate of 1359 µmol g⁻¹ h⁻¹ and efficiently removing tetracycline with a rate constant of 0.0342 min⁻¹, which increased to 0.0492 min⁻¹ in the presence of peroxymonosulfate (PMS). The piezopolarization process generates a large number of h⁺, which act as strong oxidants capable of directly oxidizing pollutant molecules through contact. The efficiency of this process is influenced by the interaction between the pollutant and the catalyst surface. This hole-mediated oxidation offers the potential for selectively degrading specific types of pollutants, particularly effective for those that are recalcitrant under certain conditions.

Furthermore, ^•OH serve as highly effective reactive species for micropollutant degradation due to their potent oxidative capacity (E⁰ = 2.80 V/NHE). Therefore, introducing activators (such as Fe²⁺ or heterogeneous catalysts) enables the efficient conversion of H₂O₂ into highly oxidizing ^•OH, significantly enhancing oxidation capacity [146–148]. The Fenton technology based on H₂O₂ and Fe²⁺ is currently one of the most effective wastewater treatment methods, but it is severely constrained by challenges in Fe²⁺ regeneration and the continuous consumption of H₂O₂. Considering that the piezocatalytic process can generate electrons for Fe³⁺ reduction and generate H₂O₂ in-situ, it offers the potential to enhance Fenton reaction efficiency. The piezocatalytically generated H₂O₂ combines with introduced Fe²⁺ to produce ^•OH, forming a Fenton system capable of efficiently degrading organic pollutants [149]. For instance, ultrathin Bi₁₂O₁₇Cl₂ leverages [Bi–O]_n interlayer-enhanced polarization to drive 2e⁻-ORR pathways, achieving 7.76 mmol g⁻¹ h⁻¹ H₂O₂ production. With Fe²⁺ addition, its apparent rate constant for acetaminophen degradation reached 0.023 min⁻¹ [70]. Similarly, ferroelectric BaTiO₃ nanoparticles under ultrasonic vibration enhance charge separation, promoting the formation of H₂O₂, and demonstrate effective degradation of various organic dyes [150]. The addition of Fe²⁺ further accelerates ^•OH generation via Fenton-mediated H₂O₂ activation, achieving Congo red degradation at k = 0.337 min⁻¹, a 6.4-fold enhancement over piezocatalysis alone.

Conventional Fenton systems predominantly utilize Fe²⁺ as an activator to decompose H₂O₂ (generated via 2e⁻-ORR) for pollutant degradation. However, kinetic competition between ORR and Fe³⁺ reduction, coupled with the difficulty in initiating water oxidation reactions, severely limits overall Fenton efficiency [84]. An ideal strategy integrates 2e⁻-WOR for H₂O₂ generation with Fe³⁺ to Fe²⁺ reduction, simultaneously leveraging electrons and holes to maximize efficiency. To overcome the high thermodynamic barrier (> 1.76 V) of 2e⁻-WOR, piezocatalysis provides separated charges that facilitate Fe³⁺ reduction, enabling piezo-self-Fenton (PSF) systems. Xu et al. developed a BiOIO₃ piezocatalyst for 2e⁻-WOR for H₂O₂ generation [151]. When coupled with Fe³⁺, it simultaneously drives WOR-H₂O₂ generation and Fe³⁺ reduction, enabling rapid subsequent Fenton reactions. The Fe³⁺-mediated PSF system exhibited a sulfamethoxazole degradation rate constant 3.5-fold higher than conventional Fe²⁺-PSF systems. Complementarily, Li et al. enhanced PTFE dispersion on ZSM-5, attaining 1978.8 µmol g⁻¹ h⁻¹ H₂O₂. Fe³⁺-initiated Fenton reactions activated H₂O₂ decomposition, degrading > 99% azo dyes in 10 min, which 6-fold faster than standalone piezocatalysis [127]. Despite progress, current piezo-Fenton systems often employ non-recoverable nanoparticles and soluble Fe²⁺, risking secondary contamination. Xie et al. addressed this by synthesizing Fe₃O₄-BaTiO₃ nanocomposites, enabling self-contained piezo-Fenton processes without external additives (Fig. 6c) [152]. This system achieved 98.2% dye degradation in acidic solutions, surpassing pure piezocatalysis and conventional Fenton by 33% and 67%, respectively. In summary, synergistic activation strategies, converting H₂O₂ to highly oxidative radicals, outperform direct oxidation in complex matrices by minimizing chemical consumption and extending operational longevity, particularly for recalcitrant pollutants. Consequently, future catalyst designs must prioritize recoverability for practical implementation. Integrating piezoelectric materials with magnetic ferrites addresses the unrecoverability limitation of conventional piezocatalysts, preventing secondary contamination while establishing a sustainable paradigm for piezo-Fenton systems.

3.2　Polymerization of organic pollutants

From a carbon-cycle perspective in water purification, oxidative polymerization offers distinct advantages over organic pollutant mineralization. It directly converts aqueous organic contaminants into solid organic polymers, enabling organic carbon recovery while mitigating the carbon-intensive drawbacks (high energy consumption and emissions) of conventional mineralization processes [153]. In H₂O₂-based advanced oxidation processes, ^•OH abstracts hydrogen atoms from functional groups (R-H) of organic substrates to generate organic radicals (R^•) [154]. While sufficient ^•OH flux drives these radicals toward oxidative degradation and ultimate mineralization, substoichiometric ROS levels shift the pathway toward radical polymerization. Under such limited ROS conditions, characteristic of piezocatalytic systems, R^• or hydroxylated radical intermediates (R^•-OH) undergo polymerization reactions. This creates an inherent advantage for piezocatalytic systems where limited ROS generation favors polymerization pathways (Fig. 7a) [155]. Aromatic radical cations form radical monomers via electron transfer and hydrogen atom elimination. During polymerization, alkoxy radicals (R^•) and aromatic radicals (e.g., phenoxyl radicals PhO^•) serve as key intermediates for coupling and chain propagation [156]. Chain reactions proceed through monomer radical oxidation to dimers, forming dimer radicals (R₂^•), while chain growth involving monomers and phenolic radicals generates R_n₋₁^•. Chain termination occurs when propagating radicals combine with R^•, yielding R_n [157]. Significantly, piezocatalytic systems inherently yield controlled concentrations of ^•OH, which function as initiators for polymer synthesis. This intrinsic polymerization propensity originates from synergistic interplay between bulk oxidative capacity and specific surface structures. Consequently, strategic modulation of catalyst surface structures, via functional group engineering and geometric configurations, enables precise regulation of pollutant transformation pathways toward polymerization or mineralization by altering adsorption energies and electrostatic potentials of pollutants and their intermediates.

The initiation of polymerization pathways relies on limited radicals that trigger coupling reactions between pollutant molecules, forming macromolecular polymers immobilized on catalyst surfaces [158]. Critically, interactions between organic compounds and catalysts play a decisive role in determining oxidation pathways and mechanisms. Chen et al. revealed that in Fhy/H₂O₂ systems, compounds containing -COOH groups exhibit highly selective oxidation due to complexation with surface Fe(Ⅲ) sites [154]. Conversely, compounds incapable of such interactions follows distinct oxidation mechanisms. Liu et al. engineered single-atom Cu on MgO to drive PMS-based Fenton reactions [159]. They demonstrated that shifting the Cu configuration from lattice-embedded to surface-loaded fundamentally altered the catalytic pathway. The optimized catalyst achieved near-complete removal of phenolic compounds via polymerization, significantly enhancing oxidant utilization efficiency. These findings underscore the critical influence of catalyst interfacial design on polymerization selectivity.

Complementarily, direct electron transfer processes selectively extract electrons from organic compounds, particularly those containing aromatic or thiophene rings, followed by proton elimination to generate monomer radicals as key intermediates [160]. These radicals subsequently undergo coupling reactions, forming chain-like polymers [161]. Illustrating this principle, Wang et al. developed a robust mechano-controlled atom transfer radical polymerization system. Under ultrasonication, mechanical energy induces electron transfer from nanoparticle surfaces to deactivators (Cu^Ⅱ/L), promoting the formation of activators (Cu^Ⅰ/L) and thereby accelerating polymerization kinetics (Fig. 7b) [162]. Meanwhile, Ding et al. employed piezoelectric ZnO nanoparticles as mechanochemical transducers to achieve precisely controlled piezoelectric-mediated reversible addition−fragmentation chain transfer (RAFT) polymerization [163]. The resulting polymers exhibited high end-group fidelity, low dispersity, and efficient chain extension capabilities.

In recent years, piezocatalytically induced organic polymerization has demonstrated unique potential for the directional transformation of environmental pollutants. Within this process, the generated ^•OH radicals serve dual functions: They act as oxidants initiating pollutant degradation, and they also form radical monomers (e.g., PhO^•) through hydrogen atom abstraction (HAA) or single-electron transfer (SET). These monomers subsequently trigger coupling polymerization, yielding macromolecular polymers immobilized on catalyst surfaces, a process synergistically governed by the electronic states and spatial constraints of the catalyst surfaces. Notably, the polymerization pathway depends on the catalyst material. Metal-based catalysts (e.g., Fe(Ⅲ)/ferrihydrite, Ca-Mn-O perovskites) induce surface-dependent chain polymerization via direct oxygen transfer pathways (DOTP) or electron transfer processes (ETP), while carbon-based materials (e.g., GP-COOFe(Ⅲ)) preferentially catalyze oligomer formation. However, critical knowledge gaps persist regarding dynamic competition mechanisms among active species (^•OH/HO₂⁻/high-valent metal-oxo), quantitative relationships between radical initiation and chain termination, and impacts of polymer formation on piezoelectric deformation and charge separation. A particularly notable absence of studies concerns polymer-induced material strain and dipole moment alterations, creating a significant theoretical barrier to advancing piezocatalytic polymerization for deep wastewater remediation.

Future developments will prioritize multiscale catalyst interface engineering, advanced in-situ characterization techniques, and optimization of piezo-electrochemical coupling processes. These efforts aim to achieve efficient transformation of pollutants into benign polymers while concurrently enhancing oxidant utilization and energy efficiency. Significantly, advancements in mechano-driven piezocatalytic polymerization, epitomized by ultrasound-mediated atom transfer radical polymerization, are establishing a new paradigm that bridges synergistic innovation between wastewater remediation and functional material synthesis.

3.3　Piezoelectric disinfection

Piezocatalysis harnesses mechanical energy (e.g., water flow, vibration) to drive piezoelectric materials, generating a polarized electric field. This field directly catalyzes the oxidation of water molecules or the reduction of oxygen molecules to produce H₂O₂. Crucially, this in-situ-generated H₂O₂ can be immediately utilized for on-site disinfection, effectively circumventing the high energy consumption and transportation leakage risks associated with traditional centralized H₂O₂ production [164]. Within piezocatalytic systems, ROS such as ^•OH and ^•O₂⁻ exert antibacterial effects by disrupting bacterial cell membranes or penetrating cells to induce oxidative stress, ultimately leading to cellular dysfunction and death [165]. Demonstrating performance enhancement, Meng et al. significantly boosted the piezoelectric response of PVDF by incorporating Cu nanosheets (CuNS) [166]. The resulting CuNS 4%/PVDF composite exhibited a piezoelectric coefficient 2.6-fold higher than pure PVDF. Under aeration, this system achieved a H₂O₂ production rate of 163.3 µmol g⁻¹ h⁻¹ via piezocatalysis. This in-situ generated H₂O₂ demonstrated exceptional disinfection efficacy, achieving 99.7% bactericidal efficiency against Escherichia coliafter 80 min of air aeration. Similarly, Yang et al. enhanced the piezoelectric properties of BaTiO₃ through sulfur doping, which improved electron-hole pair separation (Fig. 8a) [167]. The S-doped BaTiO₃ demonstrated exceptional piezocatalytic antibacterial performance, achieving 97.12% antimicrobial efficiency against S. aureus. Further illustrating this potential, Banerjee et al. synthesized a ZnO/chitosan nanocomposite for disinfection (Fig. 8b) [168]. After 20 min of ultrasonication, this composite system achieved 96% removal of E. faecalis and 98% removal of E. coli. Collectively, these studies underscore the significant promise of piezocatalytically generated in-situ H₂O₂ for advanced disinfection applications.

Beyond standalone disinfection, the ROS generation inherent in piezocatalytic H₂O₂ production systems enables the synergistic coupling of pollutant degradation and antibacterial action within a single process. Chen et al. exemplified this by developing a BiOCl piezocatalyst that achieved a high H₂O₂ production rate of 710 µmol g⁻¹ h⁻¹ through dual ORR/WOR pathways [169]. They engineered an integrated system for simultaneous H₂O₂ generation and efficient in-situ utilization, achieving 70.7% antibacterial efficiency in wastewater alongside the synchronous degradation of sulfamethoxazole (SMX). Notably, when combining the piezocatalytic system with periodate activation, SMX removal reached 94.7%, exhibiting reaction kinetics 10-fold faster than systems relying on externally added H₂O₂. This performance directly validates the practical feasibility of the "produce-and-use-immediately" approach in real-world scenarios, demonstrating that H₂O₂ production and functional utilization can be seamlessly coupled within a single system, eliminating the need for storage or transportation. This represents a critical advancement for the practical implementation of piezocatalytic technology. Furthermore, the combination of piezocatalytically generated H₂O₂ with other strong oxidants offers a promising strategy to further enhance disinfection efficacy, providing valuable insights for future optimization of piezocatalytic antibacterial systems.

Piezocatalytic antibacterial technology holds significant promise for medical sterilization, food disinfection, and water treatment, primarily due to its inherent advantages of oxidant-free operation, residue-free output, and operational simplicity. Despite notable advancements, critical challenges persist in optimizing piezoelectric material performance and expanding practical applications. Paramount among these is the incomplete mechanistic understanding of antibacterial action, specifically how material properties govern ROS generation and cell membrane disruption pathways. Compounding this challenge, the relatively low piezoelectric coefficients of most currently reported materials significantly limit their effectiveness in antibacterial applications. Consequently, future research must prioritize the strategic design of material microstructures to enhance piezocatalytic antibacterial performance while ensuring long-term stability under sustained mechanical stress and diverse environmental conditions.

4　Conclusion and prospect

Less

Piezocatalytic H₂O₂ production technology demonstrates promising application prospects due to its low material costs and clean, efficient reaction processes. However, the H₂O₂ yield remains limited primarily due to weak piezoelectric responses in catalysts, low mechanical-to-energy conversion efficiency, and insufficient active sites that hinder reactant adsorption and activation. More critically, fundamental challenges persist in elucidating H₂O₂ evolution mechanisms, conducting operando analysis of catalytic processes, achieving targeted structural modulation of piezoelectric catalysts, and developing effective H₂O₂ concentration-enhancement strategies, rendering current systems far from industrial implementation readiness.

Mechanistically, the 2e⁻-ORR is thermodynamically favorable yet kinetically limited, while the sequential single-electron pathway (2 × 1e⁻-ORR) exhibits superior kinetics but demands precise regulation of the HO₂^• adsorption-desorption equilibrium, requiring controlled adsorption energies (e.g., −0.45 eV) to prevent over-reduction to H₂O, which imposes stringent requirements on catalyst active site design and electronic structure optimization. The 2e⁻-WOR suffers from low efficiency due to its high energy barrier (E⁰ ≥ 1.77 V/NHE) and competition with the 4e⁻-OER, though it holds unique advantages in oxygen-deficient systems like wastewater treatment. Coupling ORR and WOR pathways can enhance overall efficiency, yet their synergy remains unclear, and energy/mass transfer matching requires optimization. Advancing piezocatalysis toward industrial-scale green H₂O₂ synthesis thus necessitates constructing synergistic ORR/WOR systems by elucidating intermediate transfer mechanisms via operando techniques (e.g., synchrotron radiation, in-situ FTIR) while expanding applications in oxygen-independent environments such as anoxic wastewater treatment.

At the material level, non-centrosymmetric structures facilitate driving forces through spontaneous polarization. However, critical challenges persist in addressing the temperature dependence (e.g., Curie temperature limitations) and long-term stability of the piezoelectric coefficient d₃₃. Here, piezocatalytic H₂O₂ generation performance is intrinsically governed by multiscale structural characteristics: Crystal structures determine the intrinsic efficiency of piezoelectric polarization, where orientation of polar phases and defect density directly influence charge separation and surface redox activity; heterojunction interface engineering enhances carrier mobility while suppressing electron-hole recombination through band alignment; surface modifications using noble metals create reactive sites for intermediate adsorption and H₂O₂ pathway modulation; porous structures optimize mass transport channels and active site exposure via increased specific surface area; thickness and aggregation degree must balance mechanical robustness with charge transport efficiency, where excessive values constrain spatial responses to strain-induced polarization, while insufficient values compromise structural integrity. Through cross-scale optimization of crystal-interface-surface-pore-macro parameters, coupled with enhanced mechanical energy input modes and suppressed charge recombination, comprehensive improvements in piezoresponse, selectivity, and durability become achievable. Consequently, developing multifunctional materials (e.g., 2D heterostructures, ferroelectric-semiconductor hybrids) that integrate high piezoresponse with stability, leveraging defect engineering and interfacial modulation to balance reaction pathway selectivity, while optimizing mechanical stress input via low-frequency, high-amplitude ultrasound or dynamic strain fields to maximize energy conversion efficiency and operational lifetime, establishes a robust material foundation for industrial-scale piezocatalytic applications.

Piezocatalysis leverages polarized built-in electric fields to generate in-situ H₂O₂, establishing it as a promising advanced wastewater remediation strategy. Structural asymmetry enhancement in piezoelectric materials achieves high H₂O₂ yields under mild ultrasonication, while coupling with photocatalysis concurrently elevates H₂O₂ production and enables complete organic mineralization through accelerated charge separation. To overcome the limited oxidative capacity of H₂O₂, self-sustaining PSF systems utilize piezoelectrons for continuous Fe³⁺/Fe²⁺ cycling and H₂O₂ activation, thereby circumventing the bottleneck of conventional Fenton processes and broadening applications for deep pollutant removal. Simultaneously, the reactive species (h⁺ and ROS) generated during piezoelectric processes effectively disinfect waterborne pathogens such as E. coli. On the other hand, in organic polymerization pathways, piezocatalytically derived ^•OH initiates radical monomers via hydrogen abstraction and electron transfer, facilitating pollutant coupling into solid-phase polymers for resource recovery. Moreover, catalyst interfacial characteristics critically determine reaction pathway selection. Metal-based materials such as Fe(Ⅲ)/ferrihydrite promote chain polymerization through DOTP, whereas carbon-based catalysts preferentially facilitate oligomer formation. Although ultrasound-driven mechanochemical polymerization achieves precise molecular weight control, the impact of piezoelectric deformation on polymerization kinetics remains to be elucidated.

Therefore, advancing piezocatalysis for deep wastewater purification requires prioritized development of piezo-photo-magneto multiphysics catalysts. Such systems optimize radical generation and electron transfer through interface engineering. Concurrently, establishing in-situ diagnostics will elucidate dynamic correlations among piezoelectric polarization, pollutant transformation, and material deformation, particularly polymer deposition impacts on piezoresponse. Additionally, designing pathway-specific conversion processes tailored to pollutant characteristics enables selective mineralization or controlled polymerization of recalcitrant contaminants via modulated redox potentials and surface adsorption energies. Furthermore, scaling up magnetic composite catalysts with enhanced cycling stability while developing cascade valorization pathways for polymeric products will prove pivotal for engineering implementation. Collectively, piezocatalysis drives a paradigm shift toward green, efficient, and resource-circular advanced water remediation.

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Year 2026 volume 37 Issue 10

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doi: 10.1016/j.cclet.2026.112556

Receive Date：2025-07-04
Online Date：2026-10-27
Published：2026-10-15

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History

Received：2025-07-04
Revised：2026-02-06
Accepted：2026-02-26

Affiliations

^aSchool of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China

^bHenan International Joint Laboratory of Environment and Resources, Zhengzhou 450001, China

^cState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China

^dState Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China

Corresponding:

E-mail addresses: jiaoyang@zzu.edu.cn (J. Yang)

yren@scu.edu.cn (Y. Ren)

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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Fig.1 Schematic of the ORR and WOR piezoelectric process.

Fig.2 The influence of (a) crystal structure, (b) oxygen vacancies, and (c, d) heterojunction on the production of H₂O₂ by piezoelectricity. (a) Reproduced with permission [33]. Copyright 2022, Elsevier. (b) Reproduced with permission [37]. Copyright 2020, Elsevier. (c) Reproduced with permission [42]. Copyright 2025, Elsevier. (d) Reproduced with permission [43]. Copyright 2024, Wiley.

Fig.3 The influence of (a) surface functional groups, (b) pores, (c) thickness and (d) degree of polymerization on the production of H₂O₂ by piezoelectricity. (a) Reproduced with permission [53]. Copyright 2022, Elsevier. (b) Reproduced with permission [59]. Copyright 2022, Elsevier. (c) Reproduced with permission [70]. Copyright 2024, Wiley. (d) Reproduced with permission [71]. Copyright 2024, Wiley.

Fig.4 Piezoelectric catalytic H₂O₂ production in (a) ABO₃-type perovskite, (b, c) bismuth-based layered compounds, (d) wurtzite-type materials, and (e) TMDCs systems. (a) Reproduced with permission [66]. Copyright 2025, Elsevier. (b) Reproduced with permission [84]. Copyright 2025, RSC. (c) Reproduced with permission [51]. Copyright 2024, Elsevier. (d) Reproduced with permission [86]. Copyright 2021, Elsevier. (e) Reproduced with permission [105]. Copyright 2025, Elsevier.

Fig.5 Piezocatalytic H₂O₂ production in (a) carbon-based materials, (b) polymers, (c) MOFs, and (d) MAX phase materials systems. (a) Reproduced with permission [118]. Copyright 2023, Elsevier. (b) Reproduced with permission [127]. Copyright 2024, Wiley. (c) Reproduced with permission [133]. Copyright 2024, Elsevier. (d) Reproduced with permission [136]. Copyright 2023, Elsevier.

Fig.6 Application of piezoelectrically generated H₂O₂ in organic compound oxidation. (a) Degradation of organic pollutants by ZnO/CuO piezoelectric nanocatalysts. Reproduced with permission [138]. Copyright 2023, ACS. (b) Simultaneous piezophotocatalytic H₂O₂ generation and removal of pefloxacin/Cr(VI) using BiVO₄/Ag-modified ZnO@PVDF coaxial nanofibers. Reproduced with permission [145]. Copyright 2024, Elsevier. (c) Piezo-Fenton catalytic degradation of RhB by Fe₃O₄-BaTiO₃ nanocomposites. Reproduced with permission [152]. Copyright 2024, Elsevier.

Fig.7 Application of piezoelectricity in organic polymerization. (a) Phenolation and film formation mediated by iron-ion-promoted ^•OH generation during piezoelectric catalysis. Reproduced with permission [155]. Copyright 2021, Wiley. (b) Enhancement of mechanically induced atom transfer radical polymerization (ATRP) via piezoelectrically promoted interfacial electron transfer from nanoparticles to Cu catalysts. Reproduced with permission [162]. Copyright 2017, ACS.

Fig.8 Application of piezoelectricity effect in disinfection. (a) Piezocatalytic mechanism for antibacterial and osteogenic dual therapy. Reproduced with permission [167]. Copyright 2022, Elsevier. (b) H₂O₂ production process and its subsequent in-situ applications. Reproduced with permission [168]. Copyright 2024, Elsevier.

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