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Carbon dots-incorporated CuSeO3 rationally regulates activity and selectivity of the hydrogen species via light-converted electrons
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Yuqi Rena, Hongxu Zhanga, Caihong Haoa, Qing Changa, Ning Lia, Jinlong Yanga, b, Shengliang Hua, *
Chinese Chemical Letters | 2024, 35(1) : 108225
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Chinese Chemical Letters | 2024, 35(1): 108225
• Communication •
Carbon dots-incorporated CuSeO3 rationally regulates activity and selectivity of the hydrogen species via light-converted electrons
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Yuqi Rena, Hongxu Zhanga, Caihong Haoa, Qing Changa, Ning Lia, Jinlong Yanga, b, Shengliang Hua, *
Affiliations
  • a Research Group of New Energy Materials and Devices, North University of China, Taiyuan 030051, China
  • b State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
Published: 2024-01-15 doi: 10.1016/j.cclet.2023.108225
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The chemoselective hydrogenation of structurally diverse nitroaromatics is a challenging process. Generally, catalyst activity tends to decrease when excellent selectivity is guaranteed. We here present a novel photocatalyst combining amino-functionalized carbon dots (N-CDs) with copper selenite nanoparticles (N-CDs@CuSeO3) for simultaneously improving selectivity and activity. Under visible light irradiation, the prepared N-CDs@CuSeO3 exhibits 100% catalytic selectivity for the formation of 4-aminostyrene at full conversion of 4-nitrostyrene in aqueous solvent within a few minutes. Such excellent photocatalytic performance is mainly attributed to the precise control of the hydrogen species released from the ammonia borane by means of light-converted electrons upon N-CDs@CuSeO3. Besides, the defect states at the interface of N-CDs and CuSeO3 enable holes to be trapped for promoting separation and transfer of photogenerated charges, allowing more hydrogen species to participate in catalytic reaction.

Heterostructure  /  Carbon dots  /  Photocatalysis  /  Chemoselective hydrogenation  /  Copper selenite
Yuqi Ren, Hongxu Zhang, Caihong Hao, Qing Chang, Ning Li, Jinlong Yang, Shengliang Hu. Carbon dots-incorporated CuSeO3 rationally regulates activity and selectivity of the hydrogen species via light-converted electrons[J]. Chinese Chemical Letters, 2024 , 35 (1) : 108225 - . DOI: 10.1016/j.cclet.2023.108225
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Functionalized anilines are critical to the manufacture of polymers, fertilizers, medicines, dyes, and other fine and bulk chemicals [1–5]. Normally, their production mainly relies on noncatalytic reduction of the corresponding nitroarenes taking advantage of stoichiometric reductants including sodium hydrosulfite, Fe, Sn, Zn in ammonium hydroxide [6–9]. Such processes, however, suffer from serious environmental issues, low selectivity and a great number of byproducts. Catalytic selective reduction with supported noble metal catalysts (Pt, Pd, Au, etc.) has been developed as an environmentally benign and highly efficient approach towards the synthesis of fine chemicals and fuels from renewable and sustainable feedstock [8,10–13]. Given their high cost and limited availability, more earth-abundant alternatives and low-cost heterostructures/nanocomposites are spurred for use in selective hydrogenation of organic compounds. Nevertheless, currently catalytic hydrogenation reaction usually requires a relatively high temperature, high hydrogen pressure and long reaction time to proceed. This still causes high cost and fossil energy consumption as well as eco-environmental problems [14–17].
Ammonia borane (AB) is regarded as a safe, mild and affordable reagent. At room temperature, AB releases hydrogen species onto the surface of the catalyst and then uses hydrogen species to reduce the nitroaromatic hydrocarbons to their amine derivatives for hydrogenation [18]. Unfortunately, AB also faces some serious issues, such as low efficiency, invalid release of hydrogen species and high alkaline environment during the hydrolysis process. Particularly, AB-induced hydrogenation process becomes more complicated and shows poor selectivity while another reducible functional group (e.g. C=C, C=O, C≡C and C≡N) is present in the structure of nitro-aromatics [19–21]. Therefore, it is highly desirable for a truly efficient method that enables the release of hydrogen species from AB over heterogeneous catalysts to precisely meet chemoselective hydrogenation reaction, avoiding unnecessary wastes of AB.
Carbon dots (CDs) as a promising nanocatalysis platform are attracting great attention because of their chemical stability, low cost, unique properties of photoinduced charge transfer and storage [22–26]. Due to a variety of functional groups such as -OH, -COOH and -NH2 on their surfaces [27–31], CDs tend to coordinate with metal ions; thereby they serving as heterogeneous nucleating agents can induce nucleation and growth of metal and their-related compound nanocrystals during heat treatment as well, leading to new heterostructures/nanocomposites. When used as photocatalysts for performing various catalytic reactions, these CDs-contained nanocomposites often exhibit the enhanced visible light absorption and higher efficiency for charge separation and transfer compared to the single nanophase [32]. Accordingly, using CDs as nucleating agents holds great potential for obtaining ideal bi- and multi-component photocatalysts for artificial photosynthesis and organic matter transformation [24,26,33,34]. Additionally, it has been demonstrated that the presence of an active lone-pair of electrons on the Se4+ centers can play a key role in the crystalline architecture of this family of compounds, determined by the requirement of empty space to accommodate the selenium lone-pair electrons [35]. Accordingly, the combination of the inherently asymmetry of (SeO3)2− with various transition metals enables a rich structural chemistry in transition metal selenites. Cupric selenite (CuSeO3·2H2O) exhibits a broad absorbance in visible spectrum range and superior catalytic performance owing to the presence of abundant oxygen/selenium vacancies [36].
In this contribution, we employed amino-functionalized CDs (N-CDs) as heterogeneous nucleating agents to modulate the nucleation and growth of CuSeO3 during hydrothermal conditions, acquiring a new photocatalyst of N-CDs@CuSeO3 for the first time. Not only does N-CDs@CuSeO3 possess superior visible light harvesting and charge separation efficiency, but also show a unique ability to precisely control the hydrogen species released from the AB via photogenerated electrons. As a consequent, we achieved an almost 100% selectivity in aqueous solution for the formation of 4-aminostyrene (4-AS) at 100% conversion of 4-nitrostyrene (4-NS) within 12 min of light irradiation time at room temperature.
The sample of N-CDs@CuSeO3 catalyst was prepared by co-precipitation at 130 ℃ with SeO2 as the selenite precursors and CuSO4 as the precipitation agent in the prescience of N-CDs.
For comparison, we also prepared the other sample using the same process except for no adding N-CDs and named as CuSeO3. Fig. 1a shows the X-ray diffraction (XRD) patterns of as-prepared samples. Negligible changes are observed in both sample patterns and their peaks are well matched with the crystalline CuSeO3·2H2O (JCPDS 17-00523), indicating that the CuSeO3 are successfully synthesized. Nevertheless, the diffraction peaks of N-CDs cannot be clearly observed, possibly because of relatively low crystallinity of the carbogenic cores of the N-CDs (Fig. S1 in Supporting information). To determine whether N-CDs are successfully incorporated into CuSeO3, we thereby performed X-ray photoelectron spectrum (XPS) survey analysis. As shown in Fig. 1b, N-CDs@CuSeO3 sample displays a new peak of N element and an obvious peak of C element, which should derive from N-CDs, compared with CuSeO3. The Se 3d5/2 XPS reveals a few contents of Se2− in the pure CuSeO3, whereas this case is not present in N-CDs@CuSeO3 (Fig. S2a in Supporting information). It should be attributed to the formation of copper selenides in the presence of N-dimethylformamide (DMF), which can act as a reducing agent in hydrothermal conditions [37]. This deduction is also supported by Cu 2p3/2 XPS spectra (Fig. S2b in Supporting information). Adding N-CDs could facilitate the nucleation of CuSeO3 through the coordination interaction of Cu2+ ions with amine groups on the surface of CDs, thereby inhibiting the reduction reaction between DMF and SeO32−. Furthermore, the C—O, C=O, C—N, N—O and Cu-N are also observed in C 1s and N 1s XPS spectra, indicating the presence of N-CDs in N-CDs@CuSeO3, (Figs. S2c and d in Supporting information). The ultraviolet–visible light (UV–vis) diffuse reflection spectroscopy was used to study the light absorption properties of as-prepared samples. From Fig. 1c, the sample of CuSeO3 possesses good absorption from UV to the whole visible light spectrum, while the combination of N-CDs with CuSeO3 enables the visible light absorption to enhance significantly in intensity.
The transmission electron microscopy (TEM) image shows the CuSeO3 sample is a micron-sized aggregation composed of numerous spherical nanoparticles (Fig. S3a in Supporting information). The corresponding high resolution TEM (HRTEM) image reveals the clear lattice fringes with the distance of 0.5 nm, corresponding to the CuSeO3 (110) crystalline plane (Fig. S3b in Supporting information). In contrast, a typical flake morphology feature is present in TEM images of N-CDs@CuSeO3 (Fig. S3c in Supporting information). Further HRTEM image indicates that the presented flake consists of a great number of ultrafine nanocrystals with distinct heterogeneous interfaces (Fig. S3d in Supporting information), verifying that N-CDs serving as heterogeneous nucleating agents promote the nucleation and growth of CuSeO3. Specifically, the fringes with the interplanar spacing of 0.32 and 0.5 nm presented in nanocrystals are assigned to the (002) crystal plane of N-CDs and (110) crystal plane of CuSeO3, respectively. Elemental mapping images in Fig. S3e (Supporting information) reveal that Cu, Se, C and N elements are uniformly dispersed within the N-CDs@CuSeO3 matrix, confirming the combination of N-CDs with CuSeO3. According to above results, N-CDs as nucleation agents could promote the nucleation of CuSeO3 and suppress their growth process, resulting in new morphologies and structures.
In order to verify the activity and selectivity of CuSeO3 and N-CDs@CuSeO3, selective hydrogenation of 4-NS was carried out in aqueous solution without adding any sacrificial reagent at room temperature (25 ℃), using AB as reducing agent. Compared to organic solvents, water is able to permit AB to release hydrogen species faster [37], realizing highly efficient utilization of AB. Generally, the catalytic hydrogenation of 4-NS can transform into three distinct products (Fig. 2a): 4-AS, 4-nitroethylbenzene (4-NE), and 4-ethylaniline (4-EA). From Fig. 2b, 4-NS as well as three products 4-AS, 4-NE and 4-EA have distinct characteristic absorption peaks at 311, 273, 280 and 234 nm, respectively. As thus, optical absorption spectroscopy can be used to monitor catalytic transformation processes of 4-NS in real time.
When CuSeO3 as a catalyst was added to 4-NS and AB solutions without illumination, the peak at 311 nm gradually decreased while a new peak appeared at 273 nm ascribing to the formation of 4-AS product (Fig. 2c). The catalytic reaction was stopped in 48 min. In contrast, the catalytic reaction was terminated in 18 min under visible light irradiation and the absorbance of the characteristic peak at 273 nm increased significantly (Fig. 2d), indicating more 4-AS production. Then, the catalytic performances of N-CDs@CuSeO3 were examined under the same conductions. From Fig. 2e, N-CDs@CuSeO3 exhibited better selective reduction of -NO2 than CuSeO3 under dark condition. On illumination, the conversion of 4-NS into 4-AS was 100% in 12 min (Fig. 2f). Moreover, we further confirmed the reactants and products by gas chromatography-mass spectrometry (GC-MS) after 12 min reaction. The results revealed that all the 4-NS was completely converted to the target product 4-AS (Figs. 2g and h). For easy comparison, the activity and selectivity of both samples with and without illumination were summarized in Table S1 (Supporting information). It is clearly demonstrated that both samples possess excellent selectivity, but the introduction of N-CDs into CuSeO3 can significantly enhance the activity. After 5 cycles of stability tests, more importantly, N-CDs@CuSeO3 maintained its initial selectivity with only a negligible decrease in activity (Fig. 2i). Meanwhile, by XRD characterization for the recycled samples, the crystalline structure of N-CDs@CuSeO3 was unchanged (Fig. S4 in Supporting information), suggesting excellent stability. Compared to the reported various catalysts (Table S2 in Supporting information), clearly our N-CDs@CuSeO3 performs in a superior manner.
In order to determine the roles of N-CDs in the photocatalytic performance, we first investigated the effects of the added amount of N-CDs on the catalytic activity of N-CDs@CuSeO3. As shown in Fig. S5 (Supporting information), the conversion rate of 4-NS into 4-AS firstly enhances and then decreases with the increasing of the amount of N-CDs. The optimum value is around 10 mg for sample synthesis. For comparison, N-CDs were replaced by CDs without surface modification of NH3·H2O during synthetic processes, obtaining a new sample of CDs@CuSeO3. The introduction of CDs into CuSeO3 did not realize synergistic effect in the selective hydrogenation of 4-NS to 4-AS (Fig. S6 in Supporting information), implying the critical roles of amine groups in composite system. Moreover, we conducted the photocurrent response tests. From Fig. 3a, the photocurrent intensity of the N-CDs@CuSeO3 is significantly higher than that of CuSeO3 and N-CDs, suggesting that N-CDs can facilitate the separation of photogenerated charge through forming heterogeneous interfaces with CuSeO3. It can be also confirmed by electrochemical impedance spectroscopy (EIS) spectra, in which the carrier transfer efficiency is distinguished with the radius of the semicircle in a Nyquist plot at high frequency [38–40]. As illustrated in Fig. 3b, the radius of the semicircle for N-CDs@CuSeO3 is much smaller than that of CuSeO3 and N-CDs. Accordingly, N-CDs@CuSeO3 is endowed with a lower charge transfer resistance than CuSeO3 and N-CDs, facilitating carrier transfer across the solid-liquid interface.
In addition, the energy level positions of N-CDs, CuSeO3 and N-CDs@CuSeO3 were determined by the band gaps calculated by absorption spectra and XPS valence spectra. Based on absorption spectra of N-CDs, CuSeO3 and N-CDs@CuSeO3, their optical band gaps were estimated to be 2.17, 1.90 and 2.15 eV using the Kubelka-Munk function, respectively (Figs. S7a–c in Supporting information). Then from XPS valence spectra (Figs. S7d–f in Supporting information), their valence band (VB) positions were determined as 2.72, 1.68 and 1.86 V vs. normal hydrogen electrode (NHE), respectively. Thus, their corresponding conduction band (CB) positions were also acquired as shown in Fig. S8 (Supporting information). It can be found that the VB and CB positions of CuSeO3 are modulated slightly by N-CDs owing to the formation of new interface states between N-CDs and CuSeO3. Fig. 3c illustrates the role of the interface defect levels in the charge separation and transfer [41–43]. On the one side, the photoinduced electrons in the CB of N-CDs readily transport to recombine with the holes generated in the VB of CuSeO3 at the interface defect levels, which is similar to an all-solid-state Z-scheme photocatalytic system [44–46]. On the other side, N-CDs act as sacrifice agents of holes [18], inhibiting the migration of photogenerated holes from the bulk to the surface. Consequently, more photogenerated electrons from CuSeO3 are able to participate in selectively catalytic hydrogenation reaction. To prove this proposition, the control experiments were conducted with EDTA-2Na as the hole sacrificial agent. The addition of EDTA-2Na significantly increased the activity of CuSeO3 to transform 4-NS to 4-AS, under visible light irradiation, whereas it did not influence the catalytic activity of N-CDs@CuSeO3 (Figs. 3d and e). As expected, the catalytic activity of N-CDs@CuSeO3 remarkably decreased when electron-sacrificing NaIO3 was added in reaction system (Fig. 3f). All of above results indicate that only photogenerated electrons from CuSeO3 can facilitate chemoselective reduction of 4-NS to 4-AS by AB.
Generally, the number of photogenerated electrons from photocatalysts depends on light intensity without changing other conditions. Since photogenerated electrons from CuSeO3 can promote chemoselective reduction of 4-NS, their number increase could improve conversion rate of 4-NS to 4-AS in theory. However, we surprisingly found that the generation rate of 4-AS starts to decline after 6 min of reaction time with the increase of light intensity in the presence of N-CDs@CuSeO3 catalyst (Fig. 4a). More interestingly, the amount of hydrogen evolution exhibits a similar rule with the generation rate of 4-AS relative to light intensities as well (Fig. 4b). This verifies that the activity of N-CDs@CuSeO3 changes with irradiation time under higher light intensities. To explore the reason, we checked the pH values in the reaction system with reaction time under the different light intensities. From Fig. 4c, the pH values in the reaction system gradually increase with reaction time and light intensities, implying that the amount of AB hydrolysis upon N-CDs@CuSeO3 highly relies on photogenerated electrons at the given time. The excessive decomposition of AB gives rise to an alkaline environment surrounding N-CDs@CuSeO3 and so many NH4+ ions released that cannot diffuse from catalyst surface in time. Thereby, copper ammonia complexes ([Cu(NH3)4]2+) could be formed by the reaction of NH4+ with CuSeO3 in the proper pH conditions. The copper ammonia complexes covered at the surface prevent the adsorption of the catalyst on the hydrogen species released from AB, thus influencing the activity of catalysts.
Furthermore, we examined the catalytic activity of N-CDs@CuSeO3 in different contents of AB at the given light intensity. When the added amount of AB is less than 2 mg under 10 mg of catalysts, chemoselective reduction of 4-NS to 4-AS cannot occur (Fig. S9 in Supporting information). As shown in Fig. 4d and Fig. S10 (Supporting information), overmuch AB in reaction system can also make the conversion rate of 4-NS to 4-AS decline significantly under visible light irradiation. Similarly, hydrogen evolution is also associated with the amount of AB (Fig. 4e). It is clear that more AB can create a higher pH environment surrounding N-CDs@CuSeO3 and more NH4+ ions simultaneously, thus easily inducing the reaction of NH4+ with CuSeO3 and causing the formation of copper ammonia complexes. What is noteworthy is that adding more AB in reaction system inversely boosts the conversion of 4-NS to 4-AS without illumination. Fig. 4f provides the pH variation with AB contents in the reaction system with and without illumination, respectively. It can be found that light irradiation considerably improves the pH values of reaction system. Therefore, light irradiation plays an important role in AB decomposition using N-CDs@CuSeO3 as catalysts. Although the amount of catalysts can also affect the conversion rate of 4-NS to 4-AS, their activity does not decline with their increase because of no [Cu(NH3)4]2+ production (Fig. S11 in Supporting information).
On the basis of above results, the photocatalytic mechanism of N-CDs@CuSeO3 for selective hydrogenation of 4-NS is illustrated in Fig. 4g. When the number of photogenerated electrons matches with the requirements of hydrogenation reaction of 4-NS under the proper light intensity and AB content, all photogenerated electrons are allowed to involve in the catalytic reaction and efficiently improve the conversion rate of 4-NS to 4-AS (Case 1). When there are superfluous photogenerated electrons, the invalid AB decomposition could happen on the catalyst surface analogous to adding more AB. Just like Case 2 illustrated in Fig. 4g, excessive NH4+ ions that cannot diffuse in time will attack the CuSeO3 in the suitable alkaline environment (e.g. pH > 8.05) and result in the formation [Cu(NH3)4]2+ at the surface of catalysts. This can block the contact of 4-NS and/or AB with catalysts, weakening their activity. Accordingly, the utilized efficiency of AB-released hydrogen species in chemoselective reduction of 4-NS is determined by the number of inputted photons for our presented N-CDs@CuSeO3.
In conclusion, we have developed a novel photocatalyst N-CDs@CuSeO3 that can effectively utilize visible light in selective hydrogenation reaction at room temperature without adding any sacrificing reagents. Under visible light irradiation, our presented N-CDs@CuSeO3 achieves 100% catalytic selectivity for the formation of 4-AS at full conversion of 4-NS in aqueous solvent within a few minutes. Meanwhile, N-CDs@CuSeO3 possesses superior stability and can be used repeatedly. Such excellent catalytic performance has been demonstrated to stem from the precise control of the hydrogen species released from AB using light-converted electrons upon N-CDs@CuSeO3. Besides, the defect states at the interface of N-CDs and CuSeO3 enable holes to be trapped for promoting separation and transfer of photogenerated charges, allowing more hydrogen species to participate in catalytic reaction. Accordingly, this work demonstrates that CDs can be reasonably used to design ideal photocatalytic heterostructures for highly efficient organic conversion and synthesis using solar energy.
Declaration of competing interest
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgments
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We thank for financial support Fundamental Research Program of Shanxi Province of China (No. 20210302123037), Research Project Supported by Shanxi Scholarship Council of China (No. 2022-136) and Specialized Research Fund for Sanjin Scholars Program of Shanxi Province of China.
Supplementary materials
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Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.cclet.2023.108225.
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Year 2024 volume 35 Issue 1
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doi: 10.1016/j.cclet.2023.108225
  • Receive Date：2022-12-11
  • Online Date：2025-11-20
  • Published：2024-01-15
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  • Received：2022-12-11
  • Revised：2023-02-06
  • Accepted：2023-02-12
Affiliations
    a Research Group of New Energy Materials and Devices, North University of China, Taiyuan 030051, China
    b State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
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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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