In-situ construction of CdS@ZIS Z-scheme heterojunction with core-shell structure: Defect engineering,enhance photocatalytic hydrogen evolution and inhibit photo-corrosion |
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Affiliation: | MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China |
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Abstract: | Designing the core-shell structure and controlling defect engineering are desirable for improving the performance and stability of semiconductor photocatalysts. Herein, CdS nanorods covered with ultra-thin ZnIn2S4 nanosheets, named as CdS@ZnIn2S4-SV (CdS@ZIS-SV), was synthesized through the strategy of constructing core-shell structure and regulating vacancies. The core-shell structure can confine Cd2+ and S2? locally around CdS instead of rapidly diffusing into the solution, thereby inhibiting photo-corrosion. The abundant S vacancies can capture photogenerated electrons and promote the separation of electron-hole pairs, thereby preventing the oxidation of S2? by the holes. In addition, Z-Scheme heterojunction structure helps the effective separation of electron-hole pairs. Notably, the hydrogen production rate of CdS@ZIS-SV reached 18.06 mmol g?1 h?1, which was 16.9 and 19.6 times than pristine CdS (1.16 mmol g?1 h?1) and ZIS (0.92 mmol g?1 h?1), respectively. Photoelectric Characterization (PEC), Scanning Kelvin Probe (SKP), UV–vis diffuse reflectance spectra (UV–Vis DRS), Finite-Difference Time-Domain (FDTD) explain the electron transfer mechanism and the reason for the enhanced photocatalytic activity. This work has guiding significance for the preparation of photo-catalysts with high activity and inhibiting photo-corrosion by adjusting S vacancies. |
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Keywords: | Hydrogen evolution Vacancies Z-Scheme heterojunction FDTD simulation Corrosion resistant |
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