Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 17, Pages 6529-6532Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja200884w
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Funding
- Danish Research Agency
- Strategic Research Council
- Villum Kahn Rasmussen Foundation
- Carlsberg Foundation
- European Research Council
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The role of bulk defects in the oxygen chemistry on reduced ruffle TiO2(110)-(1 x 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 similar to 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 O-2-TiO2 interaction are discussed.
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