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Competing water dissociation channels on rutile TiO2(110)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2014 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 621, 77-81 p.Article in journal (Refereed) Published
Abstract [en]

The interplay between two different water dissociation channels on rutile TiO2(110) was studied with the use of synchrotron radiation photoelectron spectroscopy. It was found that water dissociation at oxygen vacancies competes with water dissociation on defect-free regions such that one vacancy assisted dissociation event cancels one dissociation event on defect-free regions. The quenching affects the thermally most stable dissociated species that form at low coverage on the defect free surface but does not affect the stability of molecular water. As a result, molecular adsorption becomes favored at low coverage on a surface where all vacancies have been hydroxylated. The presence of competitive dissociation channels rationalizes the difficulties in identifying dissociated species on defect-free regions in previous studies.

Place, publisher, year, edition, pages
2014. Vol. 621, 77-81 p.
Keyword [en]
Titanium dioxide, Water, Adsorption, Photoelectron spectroscopy
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-222157DOI: 10.1016/j.susc.2013.11.001ISI: 000330909300011OAI: oai:DiVA.org:uu-222157DiVA: diva2:711411
Available from: 2014-04-10 Created: 2014-04-08 Last updated: 2014-04-10Bibliographically approved

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Ragazzon, Davide
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