Oxygen-Vacancy-Mediated Exciton Dissociation in BiOBr for Boosting Charge-Carrier-Involved Molecular Oxygen Activation
Top Cited Papers
- 24 January 2018
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 140 (5), 1760-1766
- https://doi.org/10.1021/jacs.7b10997
Abstract
Excitonic effects mediated by Coulomb interactions between photogenerated electrons and holes play crucial roles in photoinduced processes of semiconductors. In term of photocatalysis, however, efforts have seldom been devoted to the relevant aspects. As for the catalysts with giant excitonic effects, the co-existing, competitive exciton generation serves as a key obstacle to the yield of free charge carriers, and hence transformation of excitons into free carriers would be beneficial for optimizing the charge-carrier-involved photocatalytic processes. Herein, by taking bismuth oxybromide (BiOBr) as a prototypical model system, we demonstrate that excitons can be effectively dissociated into charge carriers with the incorporation of oxygen vacancy, leading to excellent performances in charge-carrier-involved photocatalytic reactions such as superoxide generation and selective organic syntheses under visible-light illumination. This work not only establishes an in-depth understanding of defective structures in photocatalysts, but also paves the way for excitonic regulation via defect engineering.Keywords
Funding Information
- Ministry of Education of the People's Republic of China (WK2340000063)
- Ministry of Science and Technology of the People's Republic of China (2016YFA0200602, 2017YFA0207301)
- Youth Innovation Promotion Association of the Chinese Academy of Sciences (2017493)
- Ministry of Human Resources and Social Security (BX201700219)
- National Natural Science Foundation of China (11621063, 21401181, 21573211, 21633007, U1532265, U1632149)
- Natural Science Foundation of Anhui Province (1708085QB24)
- Chinese Academy of Sciences (QYZDY-SSW-SLH011)
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