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Enhancement of Solar Hydrogen Evolution from Water by Surface Modification with CdS and TiO2 on Porous CuInS2 Photocathodes Prepared by an Electrodeposition–Sulfurization Method |
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| Authors: | Dr Jiao Zhao Dr Tsutomu Minegishi Li Zhang Dr Miao Zhong Gunawan Dr Mamiko Nakabayashi Dr Guijun Ma Dr Takashi Hisatomi Dr Masao Katayama Prof?Dr Shigeru Ikeda Prof?Dr Naoya Shibata Prof?Dr Taro Yamada Prof?Dr Kazunari Domen |
| Institution: | 1. Department of Chemical System Engineering, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, Tokyo 113‐8656 (Japan);2. Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), 5‐1‐5 Kashiwanoha, Kashiwa‐shi, Chiba 277‐8589 (Japan);3. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China);4. Department of Chemical System Engineering, The University of Tokyo, 5‐1‐5 Kashiwanoha, Kashiwa‐shi, Chiba 277‐8589 (Japan);5. Research Center for Solar Energy Chemistry, Osaka University, 1‐3 Machikaneyama, Toyonaka 560‐8531 (Japan);6. Institute of Engineering Innovation, The University of Tokyo, 2‐11‐16 Yayoi, Bunkyo‐ku, Tokyo 113‐8656 (Japan) |
| Abstract: | Porous films of p‐type CuInS2, prepared by sulfurization of electrodeposited metals, are surface‐modified with thin layers of CdS and TiO2. This specific porous electrode evolved H2 from photoelectrochemical water reduction under simulated sunlight. Modification with thin n‐type CdS and TiO2 layers significantly increased the cathodic photocurrent and onset potential through the formation of a p–n junction on the surface. The modified photocathodes showed a relatively high efficiency and stable H2 production under the present reaction conditions. |
| Keywords: | electrodeposition hydrogen production I‐III‐VI2 chalcopyrites photocathodes photoelectrochemistry |