Influence of Subsurface Defects on the Surface Reactivity of TiO2: Water on Anatase (101)

U. Aschauer, Y. He, H. Cheng, S.-C. Li, U. Diebold, A. Selloni

Department of Chemistry, Princeton University, Frick Laboratory, Princeton, New Jersey 08544, U.S.A.
Department of Physics, Tulane University, New Orleans, Louisiana 70118, U.S.A.
Faculty of Material Science and Engineering, Hubei University, 430062 Wuhan, Hubei, China

J. Phys. Chem. C 114 (2010) 1278-1284

The adsorption of water on a reduced TiO2 anatase (101) surface is investigated with scanning tunneling microscopy and density functional theory calculations. The presence of subsurface defects, which are prevalent on reduced anatase (101), leads to a higher desorption temperature of adsorbed water, indicating an enhanced binding due to the defects. Theoretical calculations of water adsorption on anatase (101) surfaces containing subsurface oxygen vacancies or titanium interstitials show a strong selectivity for water binding to sites in the vicinity of the subsurface defects. Moreover, the water adsorption energy at these sites is considerably higher than that on the stoichiometric surface, thus giving an explanation for the experimental observations. The calculations also predict facile water dissociation at these sites, confirming the important role of defects in the surface chemistry of TiO2.

Reprints available from U. Diebold (diebold at iap_tuwien_ac_at).

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