Abstract
Hydrogen and oxygen production based on photocatalytic monolithic water splitting is considered to be one of the effective ways to produce sustainable and clean energy. The key challenge in this process is to develop new photocatalysts that can simultaneously produce H2 and O2 at a stoichiometric ratio of 2:1 without the use of any sacrificial agents. In order to solve this problem, highly efficient and ingenious photosystems in nature have been studied intensively. Herein, we prepared printable Z-type composite photocatalysts CdS@TiO2/Pt/ITO/WO3/Co3O4 mimicking biological vegetative leaves in nature and constructed an “artificial leaf” device that completely decomposes water. We use an electron solid penetrating transporter ITO, which can rapidly transfer photogenerated electrons and photogenerated holes and reduce the compound rate of photogenerated carriers. Thus, the efficiency of photocatalytic total water dissolution is enhanced. This photocatalyst was able to produce both H2 and O2 in water with an H2 production rate of 75.93 μmol g−1 h−1 and an O2 production rate of 36.49 μmol g−1 h−1. We designed the oxygen-producing photocatalyst WO3/Co3O4, which produced oxygen at a rate of 159.21 μmol g−1 h−1 6 times higher than that of WO3 alone. Furthermore, the morphology, composition, and microstructures of the photocatalyst were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and nitrogen adsorption–desorption.
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Acknowledgements
This work was supported financially by Open subject of Key Laboratory of Materials Oriented Chemical Engineering at Universities of Education Department of Xinjiang Uygur Autonomous Region (20201001), Special training program for minority science and technology backbone in the natural science program of the Autonomous Region (2018D03001), Cross projects of Nanyang Institute of Technology (330078) and students innovation project of Nanyang Institute of technology.
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Chen, P., Wu, K., Peng, X. et al. Design of a Z-scheme printable artificial leaf device based on CdS@TiO2/Pt/ITO/WO3@Co3O4 for water splitting. Appl. Phys. A 128, 80 (2022). https://doi.org/10.1007/s00339-021-05223-z
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DOI: https://doi.org/10.1007/s00339-021-05223-z