Reaction of O 2 with Subsurface Oxygen Vacancies on TiO 2 Anatase (101)

Author:

Setvín Martin1,Aschauer Ulrich2,Scheiber Philipp1,Li Ye-Fei2,Hou Weiyi2,Schmid Michael1,Selloni Annabella2,Diebold Ulrike1

Affiliation:

1. Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10/134, 1040 Vienna, Austria.

2. Department of Chemistry, Princeton University, Frick Laboratory, Princeton, NJ 08544, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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