Photocatalytic Activity of Bulk TiO2 Anatase and Rutile Single Crystals Using Infrared Absorption Spectroscopy

  • Autor:

    Xu, Y. / Martinez Moreno, E. / Kunst, M. / Muhler, M. / Wang, Y, / Idriss, H. / Wöll, C. (2011)
  • Quelle:

    Phys. Rev. Letters 106 (2011), 138302
  • Datum: 2011

  • Xu, Y. / Martinez Moreno, E. / Kunst, M. / Muhler, M. / Wang, Y, / Idriss, H. / Wöll, C. (2011): „Photocatalytic Activity of Bulk TiO2 Anatase and Rutile Single Crystals Using Infrared Absorption Spectroscopy“. In: Phys. Rev. Letters 106 (2011), 138302

Abstract

A systematic study on the photocatalytic activity of well-defined, macroscopic bulk single-crystal TiO2 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 CO2 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.

 

 

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