Hierarchical nanohybrid of CuS/NiS2/Ti3C2 heterostructure with boosting charge transfer for efficient photocatalytic hydrogen evolution |
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| Affiliation: | 1. Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;2. Chongqing School, University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, PR China;2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610065, PR China;3. Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Chengdu, 610064, PR China;4. Technology Innovation Center of Hydrogen Storage-Transportation and Fueling Equipment for State Market Regulation, 610199, PR China;1. School of Environmental Science & Engineering, Huazhong University of Science & Technology, Wuhan 430074, China;2. MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China;3. Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;4. China-EU Institute for Clean and Renewable Energy, Huazhong University of Science & Technology, Wuhan 430074, China;1. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, PR China;2. Instrument Analysis Center of Xi''an Jiaotong University, Xi''an, Shaanxi 710049, PR China;1. Institut National de la Recherche Scientifique (INRS), Centre Énergie Materiaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Québec, J3X 1S2, Canada;2. School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China |
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| Abstract: | Fabricating heterostructure photocatalysts with co-catalysts can improve the separation and transfer of photo-induced electrons and holes for photocatalysis reactions. Herein, Ti3C2Tx nanosheets are obtained by chemical etching via the hydrothermal route and serve as a template for growing photocatalysts. NiS2 nanoparticles and CuS nanoneedles are deposited sequentially on the surface of Ti3C2Tx nanosheets to form “Type II” CuS/NiS2/Ti3C2Tx hierarchical heterostructure via the solvothermal method. The enormous nanoneedles morphology provides enlarged active sites for the photocatalytic processes. The fabricated CuS/NiS2/Ti3C2Tx heterostructure delivers an increased hydrogen generation rate of 32.66 mmol g?1 h?1, which is higher than that of pure CuS (2.38 folds), NiS2 (1.93 folds), and NiS2/Ti3C2Tx (1.71 folds). CuS/NiS2/Ti3C2Tx heterostructure also performs a superior hydrogen evolution retention of 97.7% after 4 cycles (one cycle lasts 4 h), implying its decent structural stability and light corrosion resistance. The reasons are ascribed to the constructed “Type II” heterostructure of CuS/NiS2 with higher active sites, improved conductivity, and efficient separation of electrons and holes. DFT calculation and Mott-Schottky plots results elucidate the formation mechanism of CuS/NiS2/Ti3C2Tx “Type II” structure. CuS/NiS2/Ti3C2Tx heterostructure also obtains a reduced bandgap with increased light absorption. The van der Waals force between 2D materials enhances the transfer of photo-generated electrons. This work demonstrates that designing hierarchical co-catalyst heterostructure without non-noble can effectively promote water splitting in the solar-to-chemical system. |
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| Keywords: | Photocatalyst Heterostructure Type II Hydrogen |
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