Elsevier

Surface Science

Volume 302, Issue 3, 1 February 1994, Pages 329-340
Surface Science

The interaction of H2O with a TiO2(110) surface

https://doi.org/10.1016/0039-6028(94)90837-0Get rights and content

Abstract

The interaction of H2O with rutile TiO2(110) surfaces with different defect densities (oxygen vacancies) was studied with TPD, work function measurements and XPS. On the nearly perfect surface, a thermal desorption peak is observed at 250–300 K which is attributed to molecularly adsorbed H2O at Ti4+ sites based on its O(1s) peak position and work function change. The heat of adsorption of water in this state is estimated to be 71-9θ kJ/mol. The coverage of water in this state is estimated from O(1s) signals to be about one per unit cell, or one for every Ti4+ site. A tail of this peak which extends to 375 K is attributed to disproportionation of surface hydroxyl groups present in lower concentrations. Higher coverages of water give rise to a TPD peak at 170 K, which we attribute to water bound to bridging oxygen anion sites. Finally, multilayer water is populated, which desorbs in a peak at 160 K. Surface hydroxyls bound to thermally-induced oxygen vacancies of ∼ 1% concentration disproportionate to give a water TPD peak at ∼ 500 K.

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    Present address: CNRS — Laboratoire M. Letort, 405 rue de Vandoeuvre, F-54600 Villers-les-Nancy, France.

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