期刊
APPLIED SURFACE SCIENCE
卷 469, 期 -, 页码 933-940出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2018.11.014
关键词
Photocatalysis; Water oxidation; alpha-Fe2O3 CoOx
类别
资金
- National Nature Science Foundation of China [21776118, 21607063, 21878134]
- China Postdoctoral Science Foundation [2017M620193, 2018M630530]
- Natural Science Foundation of Jiangsu Province [BK20161363, BK20180870]
- High-tech Research Key laboratory of Zhenjiang [SS2018002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- high-performance computing platform of Jiangsu University
For water oxidation reaction, it involves multi-electron reaction, which is the rate-determining step for the photocatalytic water splitting, meaning the photocatalytic water splitting reaction kinetic is limited by water oxidation reaction. Here, we demonstrate that the O-2 evolution reaction (OER) cocatalyst (CoOx) can dramatically improve the OER performance of the hexagonal alpha-Fe2O3 photoharvester. Although the pure hexagonal alpha-Fe2O3 is inert for water oxidation, the photocatalytic O-2 evolution rate of 5% CoOx /alpha-Fe2O3 is up to similar to 195.19 mu mol/g/h. The enhanced photocatalytic water oxidation performance can be ascribed to the effective separation of the photogenerated electron-hole pairs of alpha-Fe2O3 and the high transfer kinetics of the holes. The ESR results show that the introduction of CoO x does enhance the transfer and separation efficiency of the photogenerated carriers of the hexagonal alpha-Fe2O3. Additionally, the photocatalytic mechanism was also researched in detail.
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