Unraveling of cocatalysts photodeposited selectively on facets of BiVO4 to boost solar water splitting

Yu Qi, Jiangwei Zhang, Yuan Kong, Yue Zhao, Shanshan Chen, Deng Li, Wei Liu, Yifan Chen, Tengfeng Xie, Junyan Cui, Can Li (), Kazunari Domen and Fuxiang Zhang ()
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Yu Qi: Chinese Academy of Sciences
Jiangwei Zhang: Chinese Academy of Sciences
Yuan Kong: University of Science and Technology of China
Yue Zhao: Chinese Academy of Sciences
Shanshan Chen: Shinshu University
Deng Li: Chinese Academy of Sciences
Wei Liu: Chinese Academy of Sciences
Yifan Chen: Jilin University
Tengfeng Xie: Jilin University
Junyan Cui: Zhengzhou University
Can Li: Chinese Academy of Sciences
Kazunari Domen: Shinshu University
Fuxiang Zhang: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Bismuth vanadate (BiVO4) has been widely investigated as a photocatalyst or photoanode for solar water splitting, but its activity is hindered by inefficient cocatalysts and limited understanding of the underlying mechanism. Here we demonstrate significantly enhanced water oxidation on the particulate BiVO4 photocatalyst via in situ facet-selective photodeposition of dual-cocatalysts that exist separately as metallic Ir nanoparticles and nanocomposite of FeOOH and CoOOH (denoted as FeCoOx), as revealed by advanced techniques. The mechanism of water oxidation promoted by the dual-cocatalysts is experimentally and theoretically unraveled, and mainly ascribed to the synergistic effect of the spatially separated dual-cocatalysts (Ir, FeCoOx) on both interface charge separation and surface catalysis. Combined with the H2-evolving photocatalysts, we finally construct a Z-scheme overall water splitting system using [Fe(CN)6]3−/4− as the redox mediator, whose apparent quantum efficiency at 420 nm and solar-to-hydrogen conversion efficiency are optimized to be 12.3% and 0.6%, respectively.

Date: 2022
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DOI: 10.1038/s41467-022-28146-6

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