Res2 Nanosheets with In Situ Formed Sulfur Vacancies for Efficient and Highly Selective Photocatalytic CO2 Reduction
Date
2021
Authors
Zhang, Y.
Yao, D.
Xia, B.
Xu, H.
Tang, Y.
Davey, K.
Ran, J.
Qiao, S.-Z.
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Advisors
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Journal article
Citation
Small Science, 2021; 1(2):2000052-1-2000052-7
Statement of Responsibility
Yanzhao Zhang, Dazhi Yao, Bingquan Xia, Haolan Xu, Youhong Tang, Kenneth Davey, Jingrun Ran, and Shi-Zhang Qiao
Conference Name
Abstract
Artificial photosynthesis can provide valuable fuels and positively impact greenhouse effects, via transforming carbon dioxide (CO2) and water (H2O) into hydrocarbons using semiconductor-based photocatalysts. However, the inefficient charge-carrier dissociation and transportation as well as the lack of surface active sites are two major drawbacks to boosting their activity and selectivity in photocatalytic CO2 reduction. Recently, ReS2 has received tremendous attention in the photocatalysis area due to its intriguing physicochemical properties. Nevertheless, the application of ReS2 in photocatalytic CO2 reduction is scarcely covered. Herein, a heterojunction formed between ReS2 nanosheets and CdS nanoparticles is reported, achieving an apparently raised CO production of 7.1 μmol g 1 and high selectivity of 93.4%. The as-prepared ReS2/CdS heterojunction exhibits strengthened visible-light absorption, high-efficiency electron– hole pair separation/transfer, and increased adsorption/activation/reduction of CO2 on in situ created sulfur vacancies of ReS2, thus all favoring CO2 photoreduction. These are corroborated by advanced characterization techniques, e.g., synchrotron-based X-ray absorption near-edge structure, and density functional theory–based computations. The findings will be of broad interest in practical design and fabrication of surface active sites and semiconductor heterojunctions for applications in catalysis, electronics, and optoelectronics.
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© 2021 The Authors. Small Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.