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Chemical composition and reactivity of water on clean and oxygen-covered Pd{111}

Gladys, M. J.; El Zein, A. A.; Mikkelsen, Anders LU ; Andersen, Jesper N LU and Held, G. (2008) In Surface Science 602(22). p.3540-3549
Abstract
The chemical composition and dissociation behaviour of water adsorbed on clean and oxygen pre-covered Pd{111} was studied using high-resolution time-resolved and temperature-programmed X-ray photoelectron spectroscopy. We find that water remains intact at all temperatures up to desorption on the clean surface and at high oxygen coverage(0.69 ML) when a surface oxide is formed. The highest desorption peaks occur at 163 K from the clean surface and at 172 K from the surface oxide. At the intermediate coverage of 0.20 ML oxygen reacts with coadsorbed water at 155 K, to generate a mixed H2O/OH layer exhibiting a (root 3- x root 3)R30 degrees diffraction pattern, which is stable up to 177 K. The measured ratio between intact water and the... (More)
The chemical composition and dissociation behaviour of water adsorbed on clean and oxygen pre-covered Pd{111} was studied using high-resolution time-resolved and temperature-programmed X-ray photoelectron spectroscopy. We find that water remains intact at all temperatures up to desorption on the clean surface and at high oxygen coverage(0.69 ML) when a surface oxide is formed. The highest desorption peaks occur at 163 K from the clean surface and at 172 K from the surface oxide. At the intermediate coverage of 0.20 ML oxygen reacts with coadsorbed water at 155 K, to generate a mixed H2O/OH layer exhibiting a (root 3- x root 3)R30 degrees diffraction pattern, which is stable up to 177 K. The measured ratio between intact water and the hydroxyl species in this layer varies between 1.5 and 2 depending on temperature. (C) 2008 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Photoelectron spectroscopy, Oxygen, Catalysis, Chemisorption, Water, Palladium
in
Surface Science
volume
602
issue
22
pages
3540 - 3549
publisher
Elsevier
external identifiers
  • wos:000261361100014
  • scopus:54249150019
ISSN
0039-6028
DOI
10.1016/j.susc.2008.09.031
language
English
LU publication?
yes
id
af8e0dfa-11fe-4246-b844-fcd7c437f39c (old id 1304373)
date added to LUP
2009-03-23 14:52:42
date last changed
2016-04-15 23:47:25
@article{af8e0dfa-11fe-4246-b844-fcd7c437f39c,
  abstract     = {The chemical composition and dissociation behaviour of water adsorbed on clean and oxygen pre-covered Pd{111} was studied using high-resolution time-resolved and temperature-programmed X-ray photoelectron spectroscopy. We find that water remains intact at all temperatures up to desorption on the clean surface and at high oxygen coverage(0.69 ML) when a surface oxide is formed. The highest desorption peaks occur at 163 K from the clean surface and at 172 K from the surface oxide. At the intermediate coverage of 0.20 ML oxygen reacts with coadsorbed water at 155 K, to generate a mixed H2O/OH layer exhibiting a (root 3- x root 3)R30 degrees diffraction pattern, which is stable up to 177 K. The measured ratio between intact water and the hydroxyl species in this layer varies between 1.5 and 2 depending on temperature. (C) 2008 Elsevier B.V. All rights reserved.},
  author       = {Gladys, M. J. and El Zein, A. A. and Mikkelsen, Anders and Andersen, Jesper N and Held, G.},
  issn         = {0039-6028},
  keyword      = {Photoelectron spectroscopy,Oxygen,Catalysis,Chemisorption,Water,Palladium},
  language     = {eng},
  number       = {22},
  pages        = {3540--3549},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Chemical composition and reactivity of water on clean and oxygen-covered Pd{111}},
  url          = {http://dx.doi.org/10.1016/j.susc.2008.09.031},
  volume       = {602},
  year         = {2008},
}