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Defect-Induced Water Bilayer Growth on Anatase TiO2(101)
Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden.;Chalmers Univ Technol, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden..
Uppsala Univ, Dept Phys & Astron, POB 516, SE-75120 Uppsala, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry. Uppsala Univ, Dept Phys & Astron, POB 516, SE-75120 Uppsala, Sweden.
Lund Univ, Dept Chem, Chem Phys, POB 124, SE-22100 Lund, Sweden..
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2018 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 34, no 37, p. 10856-10864Article in journal (Refereed) Published
Abstract [en]

Preparing an anatase TiO2(101) surface with a high density of oxygen vacancies and associated reduced Ti species in the near-surface region results in drastic changes in the water adsorption chemistry compared to adsorption on a highly stoichiometric surface. Using synchrotron radiation excited photoelectron spectroscopy, we observe a change in the water growth mode, from layer-by-layer growth on the highly stoichiometric surface to bilayer growth on the reduced surface. Furthermore, we have been able to observe enrichment at the surface upon water adsorption. The Ti3+ enrichment occurs concomitant with effective water dissociation into hydroxyls with a very high thermal stability. The water bilayer on the reduced surface is thermally more stable than that on the stoichiometric surface, and it is more efficient in promoting further water dissociation upon heating. The results thus show how the presence of subsurface defects can alter the wetting mechanism of an oxide surface.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 34, no 37, p. 10856-10864
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-235880DOI: 10.1021/acs.langmuir.8b01925ISI: 000445440200005PubMedID: 30153024Scopus ID: 2-s2.0-85053564157OAI: oai:DiVA.org:kth-235880DiVA, id: diva2:1254351
Funder
Swedish Energy Agency, 36642-1Carl Tryggers foundation , CTS 12:417The Crafoord Foundation, 20060599
Note

QC 20180109

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2018-10-22Bibliographically approved

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