Latest ArticlesTuning the photoresponse of monolayer MoS2 could extend its potential application in many fields, however, it is still a challenge. In this study, CsPbBr3 nanoparticles were prepared and spin-coated on the surface of monolayer MoS2 to fabricate hybrid CsPbBr3/MoS2 photodetectors. By combing the photoelectrical property of the CsPbBr3, the synergistic effect has been systematically studied from its carrier mobility, photoresponse and detectivity. It was found that nanofilm-coating of CsPbBr3 would impede the photoelectric performance due to the electron-hole recombination facilitated by the defects at the interface of CsPbBr3 and MoS2 films. While the nanoparticles decorating was observed to significantly improve the conductivity of the monolayer MoS2, which also increased the on/off ratio of the MoS2 transistor from 8.2 × 103 to 4.4 × 104, and enhanced the carrier mobility from 0.090 cm2 V−1 s−1 to 0.202 cm2 V−1 s−1, ascribing to a mixed electron recombination-injection process. Furthermore, the CsPbBr3 nanofilm would decrease the responsivity to 136 and 178 A/W under the light wavelength of 400 and 500 nm, respectively, while decorating CsPbBr3 nanoparticles improve the photoresponse to 948 and 883 A/W with the detectivity at the level of 1011 Jones. This work may provide an easy and cost-efficient way to tune the photoresponse of MoS2 photodetectors.
Mesoporous silica hollow spheres with a homogenous and high content distribution of Fe and Co were synthesized by a facile one-pot hydrothermal process. The sub-nanometer bimetallic components inside the silica framework facilitate the stable fixation and the open accessibility to active sites. The co-doped Fe/Co in the spheres showed excellent peroxidase-like activity and much higher catalytic performance than their monometallic-supported spheres. The synergistic effect between Fe and Co promotes the continuous formation of functional radicals during the oxidation process and thus accelerates the reaction rate. When used for colorimetric detection of hydrogen peroxide (H2O2), the Fe/Co incorporated silica hollow spheres show the capability of detection of H2O2 in a wide range (10-250 µmol/L) and with the low detection limit of 0.012 ppm.
Ferroelastic materials with switchable spontaneous strain possess widely potential applications in the field of energy and information conversion. Recently, organic-inorganic hybrid halide double perovskites (OIHHDPs) have become a charming new platform for developing various functional materials, such as ferroelectrics, fluorescence and X-ray detection. Nevertheless, OIHHDP ferroelastic materials, especially high-temperature ones, are rare. Herein, we initially synthesized an OIHHDP ferroelastic, (2,2-difluoroethanamine)2[(NH4)InCl6] (1), which possesses a ferroelastic phase transition at 407 K. Moreover, thanks to the flexible B-site for OIHHDPs, we replaced the NH4+ ions within [(NH4)InCl6]n2n– formworks with K+ ions, which endows with coordination bonds between 2,2-difluoroethanamine organic cations and [KInCl6]n2n– formworks. Due to the existence of coordination bonds, the phase transition temperature of (2,2-difluoroethanamine)2[KInCl6] (2) can reach 458 K. As far as we know, this value is the highest reported in OIHHDP ferroelastics. This work offers inspiration for the design of high-temperature OIHHDP phase transition materials including ferroelectrics and ferroelastics.
Rechargeable aqueous zinc-ion batteries (AZIBs) are attracting tremendous attention because of their intrinsic merits such as high safety and low cost. Cathode plays a critical role in enhancing the electrochemical performance of AZIBs. However, it is difficult to design a robust and high-efficiency cathode material and further implement the commercialization of AZIBs. Metal-organic frameworks (MOFs) electroactive compounds are attractive to serve as the cathode of AZIBs due to their unique porosity and crystal structures, resource renewability and structural diversity. In this work, a calcium-pure terephthalates acid framework (Ca-PTA·3H2O) was synthesized by facile hydrolysis and cationic exchange method, then explored as a novel cathode for AZIBs. The results highlight a high specific capacity of 431 mAh/g (0.51 mAh/cm2) at a current density of 50 mA/g, and excellent cycle performance with capacity retention of ~90% after 2700 cycles at 500 mA/g. The following up characterizations investigate the reversible zinc storage mechanism in detail. This experiment made a specific contribution to the exploration of the new MOF as a competitive cathode for AZIBs.
Zinc indium sulfide (ZnIn2S4), a novel photocatalyst, has attracted considerable attention and been extensively studied over the past few years owing to its various advantages such as nontoxicity, structural stability, easy availability, suitable band gap and fascinating photocatalytic activity. This review mainly focuses on the recent state-of-art progress of ZnIn2S4-based photocatalysts. First, we briefly introduced preparation methods of ZnIn2S4 with diverse morphological structures. Then, considering the photocatalytic activity of pristine ZnIn2S4 would be confined by rapid recombination of photo-generated electron-hole pairs and limited light absorption range, different modulation strategies such as layer and size control, doping, vacancy engineering and hetero-nanostructures were expounded in detail. Afterwards, the applications of ZnIn2S4 in various fields such as H2 production, CO2 reduction, value-added products synthesis, pollutant purification and N2 fixation are clearly summarized. In the end, we sorted out the conclusions and outlook, aiming to provide some new insights for this fascinating material.
The performance of Li||Sb-Sn liquid metal batteries (LMBs) is hindered by the corrosion of the Sb-Sn cathode on its current collector. Herein, a uniform, dense, and low-oxidized W coating was prepared by plasma spraying, which can effectively resist the corrosion of the cathode and improve the cycle stability of the Li||Sb-Sn LMBs. For the first time, micro-CT nondestructive inspection is applied in the field of LMBs. The corrosion micromorphology and composition evolution of the SS304 matrix and Sb-Sn cathode with or without the plasma-sprayed W coating is obtained without disassembling the battery, which proves that the W coating can effectively protect the SS304 matrix. Our autonomous new LMB device for nondestructive inspection is universal and can be applied to different LMBs systems for advancing knowledge of corrosion mechanism and protection. This work guarantees the ability to directly visualize the inner critical positions in three dimensions and fills the knowledge gap in the field of LMB detection technology.
Cycloaddition of CO2 and epoxide into cyclic carbonate is one of the most efficient ways for CO2 conversion with 100% atom-utilization. Metal–organic frameworks are a kind of potential heterogeneous catalysts, however, high temperature, high pressure, and high-purity CO2 are still required for the reaction. Here, we report two new Zn(Ⅱ) imidazolate frameworks incoporating MoO42– or WO42– units, which can catalyse cycloaddition of CO2 and epichlorohydrin at room temperature and atomospheric pressure, giving 95% yield after 24 h in pure CO2 and 98% yield after 48 h in simulated flue gas (15% CO2 + 85% N2), respectively. For comparison, the analogic Zn(Ⅱ) imidazolate framework MAF-6 without non-3d metal oxide units showed 71% and 33% yields under the same conditions, respectively. The insightful modulation mechanisms of the MoO42– unit in optimizing the electronic structure of Zn(Ⅱ) centre, facilitating the rate-determined ring opening process, and minimizing the reaction activation energy, were revealed by X-ray photoelectron spectroscopy, temperature programmed desorption and computational calculations.
Radiotherapy is widely used clinically, but the toxic and side effects of nonselective killing of high-energy radiation limit its application. Finding biocompatible materials to assemble radiotherapy sensitizers and studying their sensitization patterns are of great significance for the clinical application. Here, biocompatible zinc porphyrin was chosen as sub-unit to construct various dimensional coordination frameworks. By employing top-down approach, suitable nanoframeworks with various dimensional zinc porphyrin were synthesized as radiosensitizers. The experimental data showed that high-dimensional zinc porphyrin nanoframeworks exhibit higher X-ray response performance.
Covalent organic frameworks (COFs), as highly tunable porous crystalline materials, have promising applications in potassium-ion batteries (PIBs) due to their abundant charge carrier transport channels and excellent structural stability. However, the excessive stacking of interlayer electron clouds makes it difficult to expose internal active sites. Strategies to design functional COFs with controllable morphology and copious active sites are promising but still challenging. Herein, by utilizing the condensation between 1,3,5-triformylbenzene (TFB) and p-phenylenediamine (PPD) and using amino-modified SiO2 nanospheres as templates, we synthesize core-shell NH2-SiO2@TP-COF. Through NaOH etching of NH2-SiO2@TP-COF, we obtain imine-based TP-COF hollow nanospheres, which shows excellent potassium storage performance when applied to the anode for PIBs. Ex-situ analysis and density functional theory calculations reveal that CN groups and benzenes are active sites for K+ storage.
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