期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 12, 期 18, 页码 5687-5694出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cy01200f
关键词
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资金
- National Natural Science Foundation of China [21832005, 22072071, 22102087]
- Natural Science Foundation of Shandong Province [ZR2020JQ06, ZR2021QB040]
- China Postdoctoral Science Foundation [2021M691901]
- National Key Research and Development Program of China [2020YFA0710301]
- Project for Scientific Research Innovation Team of Young Scholar in Colleges and Universities of Shandong Province [2019KJA009]
- Shandong University Multidisciplinary Research and Innovation Team of Young Scholars [2020QNQT11]
- Taishan Scholar Program of Shandong Province
By modifying BiVO4 photocatalyst with spatially separated dual cocatalysts Ag and MnOx, the activity for CO2 photoreduction can be effectively improved. The optimal activity of Ag-MnOx-BiVO4 sample is 3.1 times that of the original BiVO4, and the dual cocatalysts can effectively inhibit carrier recombination and promote the reaction.
The surface modification of dual cocatalysts on a photocatalyst is believed to effectively promote the separation of photogenerated carriers in the CO2 reduction reaction. Here, taking tetragonal BiVO4 with a strain effect as a substrate photocatalyst which has been proven to have enhanced reduction ability, BiVO4 modified with spatially separated dual cocatalysts Ag and MnOx is synthesized by a photo-deposition method for CO2 photoreduction without sacrificial agents. Compared with individual Ag-BiVO4 and MnOx-BiVO4, Ag-MnOx-BiVO4 has improved activity for reduction of CO2 to CO in a gas-solid system, which can be attributed to the spatially separated redox sites and enhanced photogenerated carrier separation efficiency. The optimal activity of the Ag-MnOx-BiVO4 sample is 3.1 times that of the original BiVO4. In addition, PL and photoelectrochemical tests indicate that the dual cocatalysts can effectively inhibit carrier recombination and promote the photocatalytic reaction. This work reports a useful strategy for constructing a photocatalytic CO2 reduction system based on a BiVO4 photocatalyst.
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