The nature of water nucleation sites on TiO2(110) surfaces revealed by ambient pressure X-ray photoelectron spectroscopy

Guido Ketteler; Susumu Yamamoto; Hendrik Bluhm; Klas Andersson; David E. Starr; D. Frank Ogletree; Hirohito Ogasawara; Anders Nilsson; Miquel Salmeron

doi:10.1021/jp068606i

The nature of water nucleation sites on TiO₂(110) surfaces revealed by ambient pressure X-ray photoelectron spectroscopy

Guido Ketteler, Susumu Yamamoto, Hendrik Bluhm, Klas Andersson, David E. Starr, D. Frank Ogletree, Hirohito Ogasawara, Anders Nilsson, Miquel Salmeron

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Abstract

X-ray photoelectron spectroscopy at ambient conditions of pressure (up to 1.5 Torr) and temperature (265 K < T < 800 K) was used to study the adsorption of water on rutile TiO₂(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 ∼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.

Original language	English
Pages (from-to)	8278-8282
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	23
DOIs	https://doi.org/10.1021/jp068606i
Publication status	Published - 2007 Jun 14

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abstract = "X-ray photoelectron spectroscopy at ambient conditions of pressure (up to 1.5 Torr) and temperature (265 K < T < 800 K) was used to study the adsorption of water on rutile TiO2(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 ∼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.",

author = "Guido Ketteler and Susumu Yamamoto and Hendrik Bluhm and Klas Andersson and Starr, {David E.} and Ogletree, {D. Frank} and Hirohito Ogasawara and Anders Nilsson and Miquel Salmeron",

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AU - Ketteler, Guido

AU - Yamamoto, Susumu

AU - Bluhm, Hendrik

AU - Andersson, Klas

AU - Starr, David E.

AU - Ogletree, D. Frank

AU - Ogasawara, Hirohito

AU - Nilsson, Anders

AU - Salmeron, Miquel

PY - 2007/6/14

Y1 - 2007/6/14

N2 - X-ray photoelectron spectroscopy at ambient conditions of pressure (up to 1.5 Torr) and temperature (265 K < T < 800 K) was used to study the adsorption of water on rutile TiO2(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 ∼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.

AB - X-ray photoelectron spectroscopy at ambient conditions of pressure (up to 1.5 Torr) and temperature (265 K < T < 800 K) was used to study the adsorption of water on rutile TiO2(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 ∼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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The nature of water nucleation sites on TiO₂(110) surfaces revealed by ambient pressure X-ray photoelectron spectroscopy

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