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题名: Transient Absorption Spectroscopy of Anatase and Rutile: The Impact of Morphology and Phase on Photocatalytic Activity
作者: Wang, Xiuli1, 2;  Kafizas, Andreas2;  Li, Xiaoe2;  Moniz, Savio J. A.3;  Reardon, Philip J. T.3;  Tang, Junwang3;  Parkin, Ivan P.4;  Durrant, James R.2
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2015-05-14
DOI: 10.1021/acs.jpcc.5b01858
卷: 119, 期:19, 页:10439-10447
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: We employed transient absorption spectroscopy (TAS) to investigate the kinetic dependences of photo catalysis in anatase and rutile TiO2 films of varying morphology. In mesoporous films, anatase was similar to 30 times more efficient than rutile in the photocatalytic degradation of an intelligent ink model system. Independent of phase, up to 100 lower levels of photocatalysis were found in dense films. Charge carrier lifetimes were probed by TAS on the microsecond to second time scale. For both rutile and anatase, recombination was independent of morphology. Rutile exhibited up to 10 times slower recombination kinetics than anatase. Efficient, irrevergible hole scavenging by alcohols was present in mesoporous anatase alone, resulting in the generation of long-lived electrons (tau approximate to 0.7 s) which, upon the addition of the dye reduction target resazurin, enabled efficient electron transfer (tau approximate to 3 ms). Hole scavenging by alcohols on mesoporous rutile was substantially less efficient and mote reversible than anatase, resulting in only a marginal increase in electron lifetime. The lower activity of rutile was not due to differences in recombination but rather to the deficiency of rutile holes to drive efficient and irreversible alcohol Oxidation.
关键词[WOS]: CHARGE-CARRIER DYNAMICS ;  THIN-FILMS ;  TIO2 PHOTOCATALYSIS ;  COLLOIDAL TIO2 ;  TRAPPED HOLES ;  WATER ;  OXIDATION ;  PHOTOOXIDATION ;  RECOMBINATION ;  PHOTOANODES
语种: 英语
WOS记录号: WOS:000354912200032
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146279
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.Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian, Peoples R China
2.Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England
3.UCL, Dept Chem Engn, London WC1E 7JE, England
4.UCL, Dept Chem, London WC1H 0AJ, England

Recommended Citation:
Wang, Xiuli,Kafizas, Andreas,Li, Xiaoe,et al. Transient Absorption Spectroscopy of Anatase and Rutile: The Impact of Morphology and Phase on Photocatalytic Activity[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2015,119(19):10439-10447.
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