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题名: Unravelling charge separation via surface built-in electric fields within single particulate photocatalysts
作者: Chen, Ruotian1, 2;  Zhu, Jian1;  An, Hongyu1, 2;  Fan, Fengtao1;  Li, Can1
刊名: FARADAY DISCUSSIONS
发表日期: 2017-06-01
DOI: 10.1039/c6fd00214e
卷: 198, 页:473-479
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Kelvin Probe Force Microscopy (KPFM) and spatially resolved surface photovoltage (SRSPV) techniques were employed to reveal built-in electric fields and surface photogenerated charge distribution on single particulate photocatalysts. The photogenerated holes and electrons spread over the whole surface of the particulate photocatalyst are imaged on n-type BiVO4 and p-type Cu2O single particles, respectively. It is demonstrated that the built-in electric field in the surface Space Charge Region (SCR) dictates the charge separation/transfer processes and allows the drift of one kind of the photogenerated carriers to the surface, while holding another kind of the carriers in the bulk. The results emphasize the role of the SCR played in the unidirectional charge transport between the bulk and surface in the particulate photocatalyst, which may be the crucial reason for low solar energy conversion efficiency.
关键词[WOS]: PROBE FORCE MICROSCOPY ;  FACETS ;  BIVO4 ;  SEMICONDUCTOR ;  CATALYST ;  JUNCTION
语种: 英语
WOS记录号: WOS:000402870300028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152236
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian Inst Chem Phys, State Key Lab Catalysis,iChEM, Zhongshan Rd 457, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Chen, Ruotian,Zhu, Jian,An, Hongyu,et al. Unravelling charge separation via surface built-in electric fields within single particulate photocatalysts[J]. FARADAY DISCUSSIONS,2017,198:473-479.
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