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Competing water dissociation channels on rutile TiO2(110)

Walle, L. E.; Ragazzon, D.; Borg, A.; Uvdal, Per LU and Sandell, A. (2014) In Surface Science 621. p.77-81
Abstract
The interplay between two different water dissociation channels on rutile TiO2(110) was studied with the use of synchrotron radiation photoelectron spectroscopy. It was found that water dissociation at oxygen vacancies competes with water dissociation on defect-free regions such that one vacancy assisted dissociation event cancels one dissociation event on defect-free regions. The quenching affects the thermally most stable dissociated species that form at low coverage on the defect free surface but does not affect the stability of molecular water. As a result, molecular adsorption becomes favored at low coverage on a surface where all vacancies have been hydroxylated. The presence of competitive dissociation channels rationalizes the... (More)
The interplay between two different water dissociation channels on rutile TiO2(110) was studied with the use of synchrotron radiation photoelectron spectroscopy. It was found that water dissociation at oxygen vacancies competes with water dissociation on defect-free regions such that one vacancy assisted dissociation event cancels one dissociation event on defect-free regions. The quenching affects the thermally most stable dissociated species that form at low coverage on the defect free surface but does not affect the stability of molecular water. As a result, molecular adsorption becomes favored at low coverage on a surface where all vacancies have been hydroxylated. The presence of competitive dissociation channels rationalizes the difficulties in identifying dissociated species on defect-free regions in previous studies. (C) 2013 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Titanium dioxide, Water, Adsorption, Photoelectron spectroscopy
in
Surface Science
volume
621
pages
77 - 81
publisher
Elsevier
external identifiers
  • wos:000330909300011
  • scopus:84891758241
ISSN
0039-6028
DOI
10.1016/j.susc.2013.11.001
language
English
LU publication?
yes
id
3ee1c7db-93b9-4037-83fc-bb24f08bdf4a (old id 4376331)
date added to LUP
2014-04-14 13:35:30
date last changed
2017-10-01 04:30:05
@article{3ee1c7db-93b9-4037-83fc-bb24f08bdf4a,
  abstract     = {The interplay between two different water dissociation channels on rutile TiO2(110) was studied with the use of synchrotron radiation photoelectron spectroscopy. It was found that water dissociation at oxygen vacancies competes with water dissociation on defect-free regions such that one vacancy assisted dissociation event cancels one dissociation event on defect-free regions. The quenching affects the thermally most stable dissociated species that form at low coverage on the defect free surface but does not affect the stability of molecular water. As a result, molecular adsorption becomes favored at low coverage on a surface where all vacancies have been hydroxylated. The presence of competitive dissociation channels rationalizes the difficulties in identifying dissociated species on defect-free regions in previous studies. (C) 2013 Elsevier B.V. All rights reserved.},
  author       = {Walle, L. E. and Ragazzon, D. and Borg, A. and Uvdal, Per and Sandell, A.},
  issn         = {0039-6028},
  keyword      = {Titanium dioxide,Water,Adsorption,Photoelectron spectroscopy},
  language     = {eng},
  pages        = {77--81},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Competing water dissociation channels on rutile TiO2(110)},
  url          = {http://dx.doi.org/10.1016/j.susc.2013.11.001},
  volume       = {621},
  year         = {2014},
}