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

被引：380

作者：

Ketteler, Guido

Yamamoto, Susumu

Bluhm, Hendrik

Andersson, Klas

Starr, David E.

Ogletree, D. Frank

Ogasawara, Hirohito

Nilsson, Anders

Salmeron, Miquel ^{[1
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[2] Stockholm Univ, FYSIKUM, AlbaNova Univ Ctr, S-10691 Stockholm, Sweden

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA

[4] SLAC, Stanford Synchrotron Radiat Lab, Menlo Pk, CA 94025 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 23期

关键词：

D O I：

10.1021/jp068606i

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 similar to 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.

引用

页码：8278 / 8282

页数：5

共 27 条

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