globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1907122116
论文题名:
Single-molecule and -particle probing crystal edge/corner as highly efficient photocatalytic sites on a single TiO2 particle
作者: Wang W.-K.; Chen J.-J.; Lou Z.-Z.; Kim S.; Fujitsuka M.; Yu H.-Q.; Majima T.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:38
起始页码: 18827
结束页码: 18833
语种: 英语
英文关键词: Crystal edge/corner ; Photocatalyst ; Single-molecule microscopy ; Single-particle microscopy ; TiO2
Scopus关键词: titanium dioxide nanoparticle ; Article ; catalyst ; confocal laser scanning microscopy ; crystal structure ; density functional theory ; electron ; exposure ; photocatalysis ; priority journal ; surface area ; total internal reflection fluorescence microscopy ; X ray diffraction
英文摘要: The exposed active sites of semiconductor catalysts are essential to the photocatalytic energy conversion efficiency. However, it is difficult to directly observe such active sites and understand the photogenerated electron/hole pairs’ dynamics on a single catalyst particle. Here, we applied a quasi-total internal reflection fluorescence microscopy and laser-scanning confocal microscopy to identify the photocatalytic active sites at a single-molecule level and visualized the photogenerated hole–electron pair dynamics on a single TiO2 particle, the most widely used photocatalyst. The experimental results and density functional theory calculations reveal that holes and electrons tend to reach and react at the same surface sites, i.e., crystal edge/corner, within a single anatase TiO2 particle owing to the highly exposed (001) and (101) facets. The observation provides solid proof for the existence of the surface junction “edge or corner” on single TiO2 particles. These findings also offer insights into the nature of the photocatalytic active sites and imply an activity-based strategy for rationally engineering catalysts for improved photocatalysis, which can be also applied for other catalytic materials. © 2019 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163535
Appears in Collections:气候变化与战略

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作者单位: Wang, W.-K., Chinese Academy of Sciences Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China, Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan, Department of Chemistry, Tongji University, Shanghai, 200000, China; Chen, J.-J., Chinese Academy of Sciences Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China; Lou, Z.-Z., Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan; Kim, S., Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan; Fujitsuka, M., Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan; Yu, H.-Q., Chinese Academy of Sciences Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China; Majima, T., Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan

Recommended Citation:
Wang W.-K.,Chen J.-J.,Lou Z.-Z.,et al. Single-molecule and -particle probing crystal edge/corner as highly efficient photocatalytic sites on a single TiO2 particle[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(38)
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