Reaction of O2 with subsurface oxygen vacancies on TiO 2 anatase (101)

Martin Setviń, Ulrich Aschauer, Philipp Scheiber, Ye Fei Li, Weiyi Hou, Michael Schmid, Annabella Selloni, Ulrike Diebold

Research output: Contribution to journalArticlepeer-review

467 Scopus citations


Oxygen (O2) adsorbed on metal oxides is important in catalytic oxidation reactions, chemical sensing, and photocatalysis. Strong adsorption requires transfer of negative charge from oxygen vacancies (VOs) or dopants, for example. With scanning tunneling microscopy, we observed, transformed, and, in conjunction with theory, identified the nature of O 2 molecules on the (101) surface of anatase (titanium oxide, TiO 2) doped with niobium. VOs reside exclusively in the bulk, but we pull them to the surface with a strongly negatively charged scanning tunneling microscope tip. O2 adsorbed as superoxo (O2 -) at fivefold-coordinated Ti sites was transformed to peroxo (O 22-) and, via reaction with a VO, placed into an anion surface lattice site as an (O2)O species. This so-called bridging dimer also formed when O2 directly reacted with VOs at or below the surface.

Original languageEnglish (US)
Pages (from-to)988-991
Number of pages4
Issue number6149
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • General


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