The Importance of Bulk Ti3+Defects in the Oxygen Chemistry on Titania Surfaces
Journal of the American Chemical Society2011Vol. 133(17), pp. 6529–6532
Citations Over TimeTop 10% of 2011 papers
Estephanía Lira, Stefan Wendt, Peipei Huo, Jonas Ø. Hansen, R. Streber, Søren Porsgaard, Yinying Wei, Ralf Bechstein, Erik Lægsgaard, Flemming Besenbacher
Abstract
The role of bulk defects in the oxygen chemistry on reduced rutile TiO(2)(110)-(1 × 1) has been studied by means of temperature-programmed desorption spectroscopy and scanning tunneling microscopy measurements. Following O(2) adsorption at 130 K, the amount of O(2) desorbing at ∼410 K initially increased with increasing density of surface oxygen vacancies but decreased after further reduction of the TiO(2)(110) crystal. We explain these results by withdrawal of excess charge (Ti(3+)) from the TiO(2)(110) lattice to oxygen species on the surface and by a reaction of Ti interstitials with O adatoms upon heating. Important consequences for the understanding of the O(2)-TiO(2) interaction are discussed.
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