Zr-doped BaTaO2N photocatalyst modified with Na–Pt cocatalyst for efficient hydrogen evolution and Z-scheme water splitting

Huihui Li; Junie Jhon M. Vequizo; Takashi Hisatomi; Mamiko Nakabayashi; Jiadong Xiao; Xiaoping Tao; Zhenhua Pan; Wenpeng Li; Shanshan Chen; Zheng Wang; Naoya Shibata; Akira Yamakata; Tsuyoshi Takata; Kazunari Domen

doi:10.1039/D2EY00031H

Zr-doped BaTaO₂N photocatalyst modified with Na–Pt cocatalyst for efficient hydrogen evolution and Z-scheme water splitting†

Huihui Li,

^ab Junie Jhon M. Vequizo,

^b Takashi Hisatomi,

^bc Mamiko Nakabayashi,^d Jiadong Xiao,^b Xiaoping Tao,^b Zhenhua Pan,

^b Wenpeng Li,^e Shanshan Chen,

^f Zheng Wang,

^g Naoya Shibata,^d Akira Yamakata,

^h Tsuyoshi Takata^b and Kazunari Domen

*^bi

Author affiliations

* Corresponding authors

^a School of Materials and Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China

^b Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano 380-8553, Japan
E-mail: domen@shinshu-u.ac.jp

^c PRESTO, JST, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan

^d Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan

^e Department of Science and Technology, Graduate School of Medicine, Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan

^f School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300-350, China

^g Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

^h Faculty of Natural Science and Technology, Okayama University, 3-1-1, Tsushima-naka, Kita-ku, Okayama, Japan

ⁱ Office of University Professors, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan

Abstract

BaTaO₂N exhibits hydrogen evolution activity under visible light with wavelengths up to 650 nm and is applicable to Z-scheme overall water splitting (ZOWS). However, the insufficient activity and selectivity of BaTaO₂N in the presence of redox mediators limit the efficiency of this process. Herein, we report the use of modified BaTaO₂N as a hydrogen evolution photocatalyst in combination with BiVO₄ and [Fe(CN)₆]^3−/4− as the oxygen evolution photocatalyst and redox mediator, respectively. Zr-doped BaTaO₂N (BaTaO₂N:Zr) synthesized by flux-assisted thermal nitridation and decorated with Na and Pt (Na–Pt) as cocatalysts was found to provide higher hydrogen evolution activity than undoped BaTaO₂N. Zr doping extended the lifetime of electrons in the BaTaO₂N and promoted electron injection into the Na–Pt cocatalysts. Consequently, Na–Pt/BaTaO₂N:Zr modified with Cr₂O₃ to suppress reverse reactions evolved hydrogen from an aqueous K₄[Fe(CN)]₆ solution. Optimizing the BaTaO₂N photocatalyst and the reaction conditions provided a ZOWS system capable of operating under visible light at wavelengths up to 520 nm. This work indicates that ZOWS systems operable under visible light can be constructed based on detailed investigations of photocatalysts, cocatalysts and redox mediators.

This article is part of the themed collections: Hydrogen production and EES Catalysis showcase

EES Catalysis

Zr-doped BaTaO₂N photocatalyst modified with Na–Pt cocatalyst for efficient hydrogen evolution and Z-scheme water splitting†

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Zr-doped BaTaO₂N photocatalyst modified with Na–Pt cocatalyst for efficient hydrogen evolution and Z-scheme water splitting

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