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Sequential cocatalyst decoration on BaTaO2N towards highly-active Z-scheme water splitting

Zheng WangResearch Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, ChinaYing LuoDepartment of Science and Technology, Graduate School of Medicine, Science and Technology, Shinshu University, Nagano, JapanTakashi HisatomiResearch Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, JapanJunie Jhon M. VequizoResearch Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, JapanSayaka SuzukiDepartment of Materials Chemistry, Faculty of Engineering, Shinshu University, Nagano, JapanShanshan ChenResearch Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, JapanMamiko NakabayashiInstitute of Engineering Innovation, The University of Tokyo, Tokyo, JapanLihua LinResearch Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, JapanZhenhua PanResearch Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, JapanNobuko KariyaScience & Innovation Center, Mitsubishi Chemical Corporation, Yokohama-shi, Kanagawa, JapanAkira YamakataGraduate School of Engineering, Toyota Technological Institute, Nagoya, JapanNaoya ShibataInstitute of Engineering Innovation, The University of Tokyo, Tokyo, JapanTsuyoshi TakataResearch Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, JapanKatsuya TeshimaDepartment of Materials Chemistry, Faculty of Engineering, Shinshu University, Nagano, Japan. [email protected]Kazunari DomenOffice of University Professors, The University of Tokyo, Tokyo, Japan. [email protected]

2021en

ABI

Annotatsiya

Abstract Oxynitride photocatalysts hold promise for renewable solar hydrogen production via water splitting owing to their intense visible light absorption. Cocatalyst loading is essential for activation of such oxynitride photocatalysts. However, cocatalyst nanoparticles form aggregates and exhibit weak interaction with photocatalysts, which prevents eliciting their intrinsic photocatalytic performance. Here, we demonstrate efficient utilization of photoexcited electrons in a single-crystalline particulate BaTaO 2 N photocatalyst prepared with the assistance of RbCl flux for H 2 evolution reactions via sequential decoration of Pt cocatalyst by impregnation-reduction followed by site-selective photodeposition. The Pt-loaded BaTaO 2 N photocatalyst evolves H 2 over 100 times more efficiently than before, with an apparent quantum yield of 6.8% at the wavelength of 420 nm, from a methanol aqueous solution, and a solar-to-hydrogen energy conversion efficiency of 0.24% in Z-scheme water splitting. Enabling uniform dispersion and intimate contact of cocatalyst nanoparticles on single-crystalline narrow-bandgap particulate photocatalysts is a key to efficient solar-to-chemical energy conversion.

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DOI: 10.1038/s41467-021-21284-3

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