The nature of the water nucleation sites on TiO2(110) surfacesrelvealed by ambient pressure x-ray photoelectron spectroscopy

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X-ray photoelectron spectroscopy at ambient conditions of pressure (up to 1.5 Torr) and temperature (265K<T<800K) was used to study the adsorption of water on rutile TiO{sub 2}(110) under conditions of thermodynamic equilibrium. It was found that OH groups in bridging positions, normally present in small amounts due to residual O-vacancies, act as nucleation sites for subsequent water adsorption. The adsorption enthalpy of water binding to these sites is {approx}70 kJ/mol, much stronger than that in the bulk liquid (45 kJ/mol). A model is proposed that relates the structure of the oxide surface to its hydrophilic character.

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Ketteler, Guido; Yamamoto, Susumu; Bluhm, Hendrik; Andersson,Klas; Starr, David E.; Ogletree, D. Frank et al. May 1, 2007.

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X-ray photoelectron spectroscopy at ambient conditions of pressure (up to 1.5 Torr) and temperature (265K<T<800K) was used to study the adsorption of water on rutile TiO{sub 2}(110) under conditions of thermodynamic equilibrium. It was found that OH groups in bridging positions, normally present in small amounts due to residual O-vacancies, act as nucleation sites for subsequent water adsorption. The adsorption enthalpy of water binding to these sites is {approx}70 kJ/mol, much stronger than that in the bulk liquid (45 kJ/mol). A model is proposed that relates the structure of the oxide surface to its hydrophilic character.

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  • Journal Name: Journal of Physical Chemistry C; Journal Volume: 111; Related Information: Journal Publication Date: 2007

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  • Report No.: LBNL--60944
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1021/jp068606i | External Link
  • Office of Scientific & Technical Information Report Number: 922811
  • Archival Resource Key: ark:/67531/metadc900184

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  • May 1, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 3:55 p.m.

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Ketteler, Guido; Yamamoto, Susumu; Bluhm, Hendrik; Andersson,Klas; Starr, David E.; Ogletree, D. Frank et al. The nature of the water nucleation sites on TiO2(110) surfacesrelvealed by ambient pressure x-ray photoelectron spectroscopy, article, May 1, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc900184/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.