Experimental evidence for mixed dissociative and molecular adsorption of water on a rutile TiO2(110) surface without oxygen vacancies

被引：109
作者：
Walle, L. E. [2 ]
Borg, A. [2 ]
Uvdal, P. [3 ,4 ]
Sandell, A. [1 ]
机构：
[1] Uppsala Univ, Dept Phys & Mat Sci, SE-75121 Uppsala, Sweden
[2] Norwegian Univ Sci & Technol NTNU, Dept Phys, NO-7491 Trondheim, Norway
[3] Lund Univ, Dept Chem, SE-22100 Lund, Sweden
[4] Lund Univ, Max Lab, SE-22100 Lund, Sweden
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 23期
关键词：
adsorption; dissociation; photoemission; synchrotron radiation; titanium compounds; water; SCANNING-TUNNELING-MICROSCOPY; H2O; 1ST-PRINCIPLES; DEFECTS; TIO2; SIMULATION; SITES; DFT; STM; O-2;
D O I：
10.1103/PhysRevB.80.235436
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present evidence for mixed molecular and dissociative water adsorption at monolayer coverage on a rutile TiO2(110) surface free from oxygen vacancies using synchrotron radiation photoemission. At monolayer coverage the OH:H2O ratio is close to 0.5 and reducing the coverage by heating yields an increased OH:H2O ratio. At room temperature neither species originating from the monolayer on the defect-free surface can be detected. The OH species of the monolayer hence recombines and leaves the surface at much lower temperatures than OH formed by water dissociation on oxygen vacancies.
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页数：5
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