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Transient Absorption Spectroscopy of Anatase and Rutile: The Impact of Morphology and Phase on Photocatalytic Activity
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
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
2015-05-14
DOI10.1021/acs.jpcc.5b01858
Volume119Issue:19Pages:10439-10447
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS KeywordCHARGE-CARRIER DYNAMICS ; THIN-FILMS ; TIO2 PHOTOCATALYSIS ; COLLOIDAL TIO2 ; TRAPPED HOLES ; WATER ; OXIDATION ; PHOTOOXIDATION ; RECOMBINATION ; PHOTOANODES
AbstractWe 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.
Language英语
WOS IDWOS:000354912200032
Citation statistics
Cited Times:61[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/146279
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Wang, Xiuli.,Kafizas, Andreas.,Li, Xiaoe.,Moniz, Savio J. A..,Reardon, Philip J. T..,...&Durrant, James R..(2015).Transient Absorption Spectroscopy of Anatase and Rutile: The Impact of Morphology and Phase on Photocatalytic Activity.JOURNAL OF PHYSICAL CHEMISTRY C,119(19),10439-10447.
MLA Wang, Xiuli,et al."Transient Absorption Spectroscopy of Anatase and Rutile: The Impact of Morphology and Phase on Photocatalytic Activity".JOURNAL OF PHYSICAL CHEMISTRY C 119.19(2015):10439-10447.
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