Abstract
A systematic study on the photocatalytic activity of well-defined, macroscopic bulk single-crystal 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 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 than the rutile (110) surface. This surprisingly large difference in activity tracks the bulk pair lifetime difference for the two modifications as determined by contactless transient photoconductance measurements on the corresponding bulk materials.
- Received 8 October 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.138302
© 2011 American Physical Society