Decorating Cu2O with Ni-doped metal organic frameworks as efficient photocathodes for solar water splitting |
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| Affiliation: | 1. College of Chemistry & Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Shanxi Supercomputing Center, Lvliang 033000, PR China;3. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China;1. Catalysis and Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India;2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India;1. College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science & Technology, Xi''an, Shaanxi, 710021, China;2. School of Materials Science & Engineering, Shaanxi University of Science & Technology, Xi''an, Shaanxi, 710021, China;1. National Institute of Fundamental Studies, Hantana Road, Kandy, Sri Lanka;2. Department of Chemistry, University of Peradeniya, Peradeniya, Lanka;3. Gunagzhou Institute of Energy Conversion, Guangzhou, China;1. Department of Materials and Science Engineering, City University of Hong Kong, Hong Kong, China;2. Department of Physics, City University of Hong Kong, Hong Kong, China;3. Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China |
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| Abstract: | Severe photocorrosion and fast photoexcited charges recombination hinder the application of Cu2O in photoelectrochemical (PEC) water splitting. In this work, Ni-doped metal-organic frameworks is firstly applied to improve the performance of electrodeposited Cu2O. A decorative layer of Ni-doped Cu3(BTC)2 (Ni-CuBTC) was in-suit constructed on Cu2O through solvothermal followed by ion-exchange. Cu2O/Ni-CuBTC photocathodes increase absorption edge to ～800 nm, positive shift flat band position to 0.4 V, and decrease Tafel value to 74 mV/dec. These results confirm the decorative layer can extend light absorption, facilitate photoexcited charge separation and transfer, and enhance HER activity. A photocurrent density of ?1.51 mA/cm2 at 0 VRHE is obtained with the decoration of Ni-CuBTC, which is 3.4 times of pristine Cu2O photocathode. Here, the PEC water splitting performance of electrodeposited Cu2O has been significantly improved with noble-metal-free decorations, which provides a new idea for solving the defects of Cu2O based photocathode. |
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| Keywords: | MOFs Ni-doped Photocathode PEC water Splitting |
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