Oxygen vacancies as active sites for water dissociation on rutile TiO2(110)

R. Schaub, P. Thostrup, N. Lopez, E. Lægsgaard, I. Stensgaard, J. K. Nørskov, F. Besenbacher*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

859 Citations (Scopus)

Abstract

Through an interplay between scanning tunneling microscopy experiments and density functional theory calculations, we determine unambiguously the active surface site responsible for the dissociation of water molecules adsorbed on rutile TiO2(110). Oxygen vacancies in the surface layer are shown to dissociate H2O through the transfer of one proton to a nearby oxygen atom, forming two hydroxyl groups for every vacancy. The amount of water dissociation is limited by the density of oxygen vacancies present on the clean surface exclusively. The dissociation process sets in as soon as molecular water is able to diffuse to the active site.

Original languageEnglish
Pages (from-to)266104-1-266104-4
Number of pages4
JournalPhysical Review Letters
Volume87
Issue number26
DOIs
Publication statusPublished - Dec 2001

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