The Importance of Bulk Ti3+ Defects in the Oxygen Chemistry on Titania Surfaces
- Estephania Lira
- ,
- Stefan Wendt
- ,
- Peipei Huo
- ,
- Jonas Ø. Hansen
- ,
- Regine Streber
- ,
- Søren Porsgaard
- ,
- Yinying Wei
- ,
- Ralf Bechstein
- ,
- Erik Lægsgaard
- , and
- Flemming Besenbacher
Abstract
The role of bulk defects in the oxygen chemistry on reduced rutile TiO2(110)−(1 × 1) has been studied by means of temperature-programmed desorption spectroscopy and scanning tunneling microscopy measurements. Following O2 adsorption at 130 K, the amount of O2 desorbing at ∼410 K initially increased with increasing density of surface oxygen vacancies but decreased after further reduction of the TiO2(110) crystal. We explain these results by withdrawal of excess charge (Ti3+) from the TiO2(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 O2−TiO2 interaction are discussed.
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