期刊
CHEMCATCHEM
卷 8, 期 3, 页码 615-623出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201501035
关键词
doping; oxygen; photochemistry; strontium; water splitting
资金
- National Natural Science Foundation of China [21401142]
- Shanghai Science and Technology Commission [14DZ2261100]
- Fundamental Research Funds for the Central Universities
Photocatalytic water splitting is an appealing process for solar energy conversions yet it is often limited by the slow oxidation of water to oxygen half-reaction. Here we performed an investigation on N-doped Sr4Nb2O9 as a water oxidation photocatalyst. Our results show that N doping is an effective approach to improve the visible-light response of Sr4Nb2O9. Efficient photocatalytic oxygen production was observed after N doping, and the highest production rate of approximate to 27molh(-1) under visible-light irradiation corresponds to an apparent quantum efficiency of approximate to 0.31%. Clear anodic photocurrent can be generated under visible-light illumination, and the flat-band potential was determined to be approximate to-1.25V vs. Ag/AgCl at pH7. Theoretical calculations reveal that N doping introduces additional valence bands and is responsible for the visible-light response. Variations in light absorption and photo-oxidation performance can be controlled by modifying these valence band positions using different nitridation temperatures.
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