Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

被引：1719

作者：

Li, Rengui ^{[1
,2
]}

Zhang, Fuxiang ^{[1
]}

Wang, Donge ^{[1
]}

Yang, Jingxiu ^{[1
,2
]}

Li, Mingrun ^{[1
]}

Zhu, Jian ^{[1
,2
]}

Zhou, Xin ^{[1
]}

Han, Hongxian ^{[1
]}

Li, Can ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, State Key Lab Catalysis, Dalian 116023, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

NATURE COMMUNICATIONS | 2013年 / 4卷

基金：

中国国家自然科学基金;

关键词：

TIO2 NANOTUBE ARRAYS; VISIBLE-LIGHT; CHARGE SEPARATION; PHOTOELECTROCHEMICAL PROPERTIES; SOLAR-CELLS; WATER; DYE; OXIDE; EVOLUTION; POWDER;

D O I：

10.1038/ncomms2401

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Charge separation is crucial for increasing the activity of semiconductor-based photocatalysts, especially in water splitting reactions. Here we show, using monoclinic bismuth vanadate crystal as a model photocatalyst, that efficient charge separation can be achieved on different crystal facets, as evidenced by the reduction reaction with photogenerated electrons and oxidation reaction with photogenerated holes, which take place separately on the {010} and {110} facets under photo-irradiation. Based on this finding, the reduction and oxidation cocatalysts are selectively deposited on the {010} and {110} facets respectively, resulting in much higher activity in both photocatalytic and photoelectrocatalytic water oxidation reactions, compared with the photocatalyst with randomly distributed cocatalysts. These results show that the photogenrated electrons and holes can be separated between the different facets of semiconductor crystals. This finding may be useful in semiconductor physics and chemistry to construct highly efficient solar energy conversion systems.

引用

页数：7

共 55 条

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