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学科主题: 物理化学
题名: Kinetics and Dynamics of Photocatalyzed Dissociation of Ethanol on TiO2(110)
作者: Ma, Zhi-bo1;  Zhou, Chuan-yao1;  Mao, Xin-chun1;  Ren, Ze-feng1;  Dai, Dong-xu1;  Yang, Xue-ming1
通讯作者: 周传耀 ;  杨学明
关键词: Two-photon photoemission ;  Photocatalysis ;  TiO2 ;  Kinetic ;  Ultrafast dynamic
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2013-02-27
DOI: 10.1063/1674-0068/26/01/1-7
卷: 26, 期:1, 页:1-7
收录类别: SCI
文章类型: Article
部门归属: 11
项目归属: 1102
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Physics
英文摘要: The kinetics and dynamics of photocatalyzed dissociation of ethanol on TiO2(110) surface have been studied using the time-dependent and time-resolved femtosecond two-photon photoemission spectroscopy respectively, in order to unravel the photochemical properties of ethanol on this prototypical metal oxide surface. By monitoring the time evolution of the photoinduced excited state which is associated with the photocatalyzed dissociation of ethanol on Ti-5c sites of TiO2(110), the fractal-like kinetics of this surface photocatalytic reaction has been obtained. The measured photocatalytic dissociation rate on reduced TiO2(110) is faster than that on the oxidized surface. This is attributed to the larger defect density on the reduced surface which lowers the reaction barrier of the photocatalytic reaction at least methodologically. Possible reasons associated with the defect electrons for the acceleration have been discussed. By performing the interferometric two-pulse correlation on ethanol/TiO2(110) interface, the ultrafast electron dynamics of the excited state has been measured. The analyzed lifetime (24 fs) of the excited state is similar to that on methanol/TiO2(110). The appearance of the excited state provides a channel to mediate the electron transfer between the TiO2 substrate and its environment. Therefore studying its ultrafast electron dynamics may lead to the understanding of the microscopic mechanism of photocatalysis and photoelectrochemical energy conversion on TiO2.
关键词[WOS]: HYDROGEN-PRODUCTION ;  SURFACE-CHEMISTRY ;  RUTILE TIO2(110) ;  TIO2 SURFACES ;  DEFECTS ;  OXYGEN ;  WATER ;  PHOTOEMISSION ;  ELECTRONS ;  SCIENCE
语种: 英语
WOS记录号: WOS:000316093500001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/117641
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 Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

Recommended Citation:
Ma, Zhi-bo,Zhou, Chuan-yao,Mao, Xin-chun,et al. Kinetics and Dynamics of Photocatalyzed Dissociation of Ethanol on TiO2(110)[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2013,26(1):1-7.
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