Photocatalytic activity of bulk TiO2 anatase and rutile single crystals using infrared absorption spectroscopy

Photocatalytic activity of bulk TiO2 anatase and rutile single crystals using infrared absorption spectroscopy

A systematic study on the photocatalytic activity of well-defined, macroscopic bulk single-crystal TiO(2) anatase and rutile samples has been carried out, which allows us to link photoreactions at surfaces of well-defined oxide semiconductors to an important bulk property with regard to photochemist...

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Veröffentlicht in:Physical review letters 2011-04, Vol.106 (13), p.138302-138302
Hauptverfasser: Xu, Mingchun, Gao, Youkun, Moreno, Elias Martinez, Kunst, Marinus, Muhler, Martin, Wang, Yuemin, Idriss, Hicham, Wöll, Christof
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container_end_page 138302
container_issue 13
container_start_page 138302
container_title Physical review letters
container_volume 106
creator Xu, Mingchun
Gao, Youkun
Moreno, Elias Martinez
Kunst, Marinus
Muhler, Martin
Wang, Yuemin
Idriss, Hicham
Wöll, Christof
description A systematic study on the photocatalytic activity of well-defined, macroscopic bulk single-crystal TiO(2) anatase and rutile samples has been carried out, which allows us to link photoreactions at surfaces of well-defined oxide semiconductors to an important bulk property with regard to photochemistry, the life time of e-h pairs generated in the bulk of the oxides by photon absorption. The anatase (101) surface shows a substantially higher activity, by an order of magnitude, for CO photo-oxidation to CO(2) than the rutile (110) surface. This surprisingly large difference in activity tracks the bulk e-h pair lifetime difference for the two TiO(2) modifications as determined by contactless transient photoconductance measurements on the corresponding bulk materials.
doi_str_mv 10.1103/PhysRevLett.106.138302
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title Photocatalytic activity of bulk TiO2 anatase and rutile single crystals using infrared absorption spectroscopy
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