期刊
SCIENCE BULLETIN
卷 67, 期 11, 页码 1137-1144出版社
ELSEVIER
DOI: 10.1016/j.scib.2022.01.013
关键词
Dynamic Cl defects; Bi5O7Cl; Photocatalytic CO2 reduction; Selectivity; Solar energy conversion
资金
- National Natural Science Foundation of China [21822601, 22176029]
- Excellent Youth Foundation of Sichuan Scientific Committee [2021JDJQ0006]
- Fundamental Research Funds for the Central Universities [ZYGX2019Z021]
- 111 Project [B20030]
Dynamic halogen defects in bismuth oxyhalide materials can enhance photocatalytic efficiency and promote CO2 reduction.
Dynamic defects on halide perovskite materials, caused by ion dissociation and migration under light illumination, typically result in undesirable energy dissipation and limited energy conversion efficiency. However, in this work, we demonstrated that dynamic halogen defects generated by the same process in bismuth oxyhalide (Bi5O7Cl) materials can act as active sites to promote charge separation and photocatalytic efficiency. Mechanistic studies and density functional theory calculations revealed that dynamic Cl defects affected the electronic structure of Bi5O7Cl and photocatalytic CO2 reduction process. As active sites, these defects promoted charge transfer, leading to the activation of adsorbed CO2 molecules and reduction of the energy barrier of the rate-determining step. Thus, CO2 was spontaneously converted into COOH intermediate and finally reduced to CO with a high efficiency of 108.60 lmol g(-1) and selectivity of 100% after 4-h of CO2 photoreduction. This work is highly instructive and valuable to the exploration of dynamic defects on halide-containing materials applied in solar energy conversion. (C) 2022 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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