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题名: Time-resolved infrared spectroscopic investigation of roles of valence states of Cr in (La,Cr)-doped SrTiO3 photocatalysts
作者: Shen, Shuai1, 2;  Jia, Yushuai1, 2;  Fan, Fengtao1;  Feng, Zhaochi1;  Li, Can1
关键词: Time-resolved spectroscopy ;  Chromium doping ;  Strontium titanate ;  Photocatalysis
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2013-11-01
DOI: 10.1016/S1872-2067(12)60702-5
卷: 34, 期:11, 页:2036-2040
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The kinetics of photogenerated electrons in SrTiO3(La,Cr) pretreated with either H-2 or O-2 were studied using time-resolved infrared spectroscopy. The X-ray photoelectron and Raman spectra showed that the Cr cations in the sample reduced with H-2 were all in Cr3+, whereas those oxidized with O-2 were in mixed of Cr3+ and Cr6+. Electrons excited with 355 and 532 nm light pulses showed the absorption of mid-IR light, and this was traced as a function of the time delay in a microsecond domain. The time-resolved results revealed that the decay rate of the photoinduced electrons with Cr3+ was slower than that with Cr6+, implying that trivalent Cr contributed more to retarding recombination of photoinduced electrons and holes, and enhanced photocatalytic H-2 production activity. (C) 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
关键词[WOS]: VISIBLE-LIGHT IRRADIATION ;  PHOTOGENERATED ELECTRONS ;  ABSORPTION SPECTROSCOPY ;  HYDROGEN-PRODUCTION ;  RAMAN-SPECTROSCOPY ;  H-2 EVOLUTION ;  DOPED SRTIO3 ;  TIO2 ;  CHROMIUM ;  PT/TIO2
语种: 英语
WOS记录号: WOS:000326769800011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137990
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, Dalian 116023, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Shen, Shuai,Jia, Yushuai,Fan, Fengtao,et al. Time-resolved infrared spectroscopic investigation of roles of valence states of Cr in (La,Cr)-doped SrTiO3 photocatalysts[J]. CHINESE JOURNAL OF CATALYSIS,2013,34(11):2036-2040.
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