Charge redistribution of a spatially differentiated ferroelectric Bi4Ti3O12 single crystal for photocatalytic overall water splitting

Guangri Jia, Fusai Sun, Tao Zhou, Ying Wang, Xiaoqiang Cui, Zhengxiao Guo (), Fengtao Fan () and Jimmy C. Yu ()
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Guangri Jia: The Chinese University of Hong Kong, Shatin, New Territories
Fusai Sun: Chinese Academy of Sciences
Tao Zhou: The University of Hong Kong
Ying Wang: The Hong Kong Polytechnic University, Hung Hom, Kowloon
Xiaoqiang Cui: Jilin University
Zhengxiao Guo: The University of Hong Kong
Fengtao Fan: Chinese Academy of Sciences
Jimmy C. Yu: The Chinese University of Hong Kong, Shatin, New Territories

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Artificial photosynthesis is a promising approach to produce clean fuels via renewable solar energy. However, it is practically constrained by two issues of slow photogenerated carrier migration and rapid electron/hole recombination. It is also a challenge to achieve a 2:1 ratio of H2 and O2 for overall water splitting. Here we report a rational design of spatially differentiated two-dimensional Bi4Ti3O12 nanosheets to enhance overall water splitting. Such a spatially differentiated structure overcomes the limitation of charge transfer across different crystal planes in a single crystal semiconductor. The experimental results show a redistribution of charge within a crystal plane. The resulting photocatalyst produces 40.3 μmol h–1 of hydrogen and 20.1 μmol h–1 of oxygen at a near stoichiometric ratio of 2:1 and a solar-to-hydrogen efficiency of 0.1% under simulated solar light.

Date: 2024
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DOI: 10.1038/s41467-024-49168-2

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