Water Dissociation on Single Crystalline Anatase TiO2(001) Studied by Photoelectron Spectroscopy
(2008) In Journal of Physical Chemistry C 112(42). p.16616-16621- Abstract
- The adsorption of water on the anatase TiO2(001)-(4 x 1) surface is studied using synchrotron radiation-excited core level photoelectron spectroscopy. The coverage-dependent adsorption of water at low temperature is monitored and compared to the sequence obtained after heating of a water multilayer. Two adsorption phases of submonolayer coverage can be defined: Phase 1 consists only of dissociated water, observed as OH-groups. This phase is found at low coverage at low temperature (190 K) and is the only state of adsorbed water above similar to 230 K. The saturation coverage of phase 1 is consistent with dissociation on the 4-fold-coordinated Ti ridge atoms of the (4 x 1) surface reconstruction. Phase 2 is found at higher coverage, reached... (More)
- The adsorption of water on the anatase TiO2(001)-(4 x 1) surface is studied using synchrotron radiation-excited core level photoelectron spectroscopy. The coverage-dependent adsorption of water at low temperature is monitored and compared to the sequence obtained after heating of a water multilayer. Two adsorption phases of submonolayer coverage can be defined: Phase 1 consists only of dissociated water, observed as OH-groups. This phase is found at low coverage at low temperature (190 K) and is the only state of adsorbed water above similar to 230 K. The saturation coverage of phase 1 is consistent with dissociation on the 4-fold-coordinated Ti ridge atoms of the (4 x 1) surface reconstruction. Phase 2 is found at higher coverage, reached at lower temperature. It consists of a mixture of dissociated and molecular water with a ratio of 1:1 at 170 K. The molecular water is found to bond to the hydroxyl groups. The hydroxyl coverage of phase 2 is approximately 2 times that of phase 1. The results suggest that the OH and H2O species of phase 2 are confined to the ridges of the surface. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1284661
- author
- Blomquist, Jakob LU ; Walle, L. E. ; Uvdal, Per LU ; Borg, A. and Sandell, A.
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry C
- volume
- 112
- issue
- 42
- pages
- 16616 - 16621
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000260129400071
- scopus:55649108440
- ISSN
- 1932-7447
- DOI
- 10.1021/jp805664b
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- b8de69c7-a2ef-4f54-adc1-795a3fc37baa (old id 1284661)
- date added to LUP
- 2016-04-01 12:15:17
- date last changed
- 2022-01-27 01:06:24
@article{b8de69c7-a2ef-4f54-adc1-795a3fc37baa,
abstract = {{The adsorption of water on the anatase TiO2(001)-(4 x 1) surface is studied using synchrotron radiation-excited core level photoelectron spectroscopy. The coverage-dependent adsorption of water at low temperature is monitored and compared to the sequence obtained after heating of a water multilayer. Two adsorption phases of submonolayer coverage can be defined: Phase 1 consists only of dissociated water, observed as OH-groups. This phase is found at low coverage at low temperature (190 K) and is the only state of adsorbed water above similar to 230 K. The saturation coverage of phase 1 is consistent with dissociation on the 4-fold-coordinated Ti ridge atoms of the (4 x 1) surface reconstruction. Phase 2 is found at higher coverage, reached at lower temperature. It consists of a mixture of dissociated and molecular water with a ratio of 1:1 at 170 K. The molecular water is found to bond to the hydroxyl groups. The hydroxyl coverage of phase 2 is approximately 2 times that of phase 1. The results suggest that the OH and H2O species of phase 2 are confined to the ridges of the surface.}},
author = {{Blomquist, Jakob and Walle, L. E. and Uvdal, Per and Borg, A. and Sandell, A.}},
issn = {{1932-7447}},
language = {{eng}},
number = {{42}},
pages = {{16616--16621}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Journal of Physical Chemistry C}},
title = {{Water Dissociation on Single Crystalline Anatase TiO2(001) Studied by Photoelectron Spectroscopy}},
url = {{http://dx.doi.org/10.1021/jp805664b}},
doi = {{10.1021/jp805664b}},
volume = {{112}},
year = {{2008}},
}