Reaction of O 2 with Subsurface Oxygen Vacancies on TiO 2 Anatase (101)
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- 30 August 2013
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 341 (6149), 988-991
- https://doi.org/10.1126/science.1239879
Abstract
Oxide Chemistry Below the Surface: Although metal oxides, such as titanium dioxide (TiO 2 ), are used for catalytic oxidation reactions and photocatalysis, the O 2 does not react directly with substrates. Vacancies in the surface region of the TiO 2 rutile phase can transfer a negative charge to adsorbed O 2 to create more reactive species. By contrast, in anatase—the phase associated with nanoscale TiO 2 particles—subsurface vacancies form. Setvin et al. (p. 988 ) used a scanning tunneling microscopy tip to pull these vacancies to the surface in a niobiumdoped anatase crystal and followed the transformation of adsorbed O 2 − into a peroxo species and a bridging O 2 dimer.Keywords
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