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

Zheng Wang, Ying Luo, Takashi Hisatomi, Junie Jhon M. Vequizo, Sayaka Suzuki, Shanshan Chen, Mamiko Nakabayashi, Lihua Lin, Zhenhua Pan, Nobuko Kariya, Akira Yamakata, Naoya Shibata, Tsuyoshi Takata, Katsuya Teshima () and Kazunari Domen ()
Additional contact information
Zheng Wang: Shinshu University
Ying Luo: Shinshu University
Takashi Hisatomi: Shinshu University
Junie Jhon M. Vequizo: Shinshu University
Sayaka Suzuki: Shinshu University
Shanshan Chen: Shinshu University
Mamiko Nakabayashi: Institute of Engineering Innovation, The University of Tokyo
Lihua Lin: Shinshu University
Zhenhua Pan: Shinshu University
Nobuko Kariya: Mitsubishi Chemical Corporation
Akira Yamakata: Toyota Technological Institute
Naoya Shibata: Institute of Engineering Innovation, The University of Tokyo
Tsuyoshi Takata: Shinshu University
Katsuya Teshima: Shinshu University
Kazunari Domen: Shinshu University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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 BaTaO2N photocatalyst prepared with the assistance of RbCl flux for H2 evolution reactions via sequential decoration of Pt cocatalyst by impregnation-reduction followed by site-selective photodeposition. The Pt-loaded BaTaO2N photocatalyst evolves H2 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.

Date: 2021
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DOI: 10.1038/s41467-021-21284-3

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