期刊
NATIONAL SCIENCE REVIEW
卷 7, 期 3, 页码 652-659出版社
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwz198
关键词
bismuth chromate; dipole moment; internal electric field; water oxidation; complete mineralization
资金
- National Natural Science Foundation of China [21437003, 21673126, 21761142017, 21621003, 21872077]
- Collaborative Innovation Center for Regional Environmental Quality
Herein, a wide-spectrum (similar to 678 nm) responsive Bi-8(CrO4)O-11 photocatalyst with a theoretical solar spectrum efficiency of 42.0% was successfully constructed. Bi-8(CrO4)O-11 showed highly efficient and stable photocatalytic water oxidation activity with a notable apparent quantum efficiency of 2.87% (420 nm), superior to many reported wide-spectrum driven photocatalysts. Most remarkably, its strong oxidation ability also enables the simultaneous degradation and complete mineralization for phenol, and its excellent performance is about 23.0 and 2.9 times higher than CdS and P25-TiO2, respectively. Its high activity is ascribed to the giant internal electric field induced by its large crystal dipole, which accelerates the rapid separation of photogenerated electron-hole pairs. Briefly, the discovery of wide-spectrum bismuth chromate and the mechanism of exponentially enhanced photocatalytic performance by increasing the crystal dipole throw light on improving solar energy conversion.
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