Others Scalable water splitting on particulate photocatalyst sheets with a solar-to-hydrogen energy conversion efficiency exceeding 1%

Wang, Qian  ,  Hisatomi, Takashi  ,  Jia, Qingxin  ,  Tokudome, Hiromasa  ,  Zhong, Miao  ,  Wang, Chizhong  ,  Pan, Zhenhua  ,  Takata, Tsuyoshi  ,  Nakabayashi, Mamiko  ,  Shibata, Naoya  ,  Li, Yanbo  ,  Sharp, Ian D.  ,  Kudo, Akihiko  ,  Yamada, Taro  ,  Domen, Kazunari

2016-03-07 , Nature Publishing Group , Department of Chemical System Engineering, School of Engineering, The University of Tokyo , Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem) , Research Institute, TOTO Ltd. , Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Institute of Engineering Innovation, The University of Tokyo , Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory , Department of Applied Chemistry, Tokyo University of Science
ISSN:1476-4660
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UTokyo Research掲載「太陽光を用いて水を分解できる粉末光触媒シート」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/solar-water-splitting-using-particulate-photocatalyst-sheets.html
UTokyo Research "Solar water splitting using particulate photocatalyst sheets" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/solar-water-splitting-using-particulate-photocatalyst-sheets.html
Photocatalytic water splitting using particulate semiconductors is a potentially scalable and economically feasible technology for converting solar energy into hydrogen. Z-scheme systems based on two-step photoexcitation of a hydrogen evolution photocatalyst (HEP) and an oxygen evolution photocatalyst (OEP) are suited to harvesting of sunlight because semiconductors with either water reduction or oxidation activity can be applied to the water splitting reaction. However, it is challenging to achieve efficient transfer of electrons between HEP and OEP particles. Here, we present photocatalyst sheets based on La- and Rh-codoped SrTiO3 (SrTiO3:La, Rh; ref. 8) and Mo-doped BiVO4 (BiVO4:Mo) powders embedded into a gold (Au) layer. Enhancement of the electron relay by annealing and suppression of undesirable reactions through surface modification allow pure water (pH 6.8) splitting with a solar-to-hydrogen energy conversion efficiency of 1.1% and an apparent quantum yield of over 30% at 419 nm. The photocatalyst sheet design enables efficient and scalable water splitting using particulate semiconductors.
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