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Modifying the adsorption characteristics of water on Ru{0001} with preadsorbed oxygen

Gladys, M. J.; El-Zein, A. A.; Mikkelsen, Anders LU ; Andersen, Jesper N LU and Held, G. (2008) In Physical Review B (Condensed Matter and Materials Physics) 78(3).
Abstract
The coadsorption of water and preadsorbed oxygen on Ru{0001) was studied by synchrotron-based high-resolution x-ray photoelectron spectroscopy. A dramatic change was observed in the interaction of water with oxygen between low and high oxygen precoverages. Low oxygen coverages below 0.18 ML induce partial dissociation, which leads to an adsorbed layer of H2O and OH. Around half the oxygen atoms take part in this reaction. All OH recombines upon heating to 200 K and desorbs together with H2O. Oxygen coverages between 0.20 and 0.50 ML inhibit dissociation, instead a highly stable intact water species is observed, which desorbs at 220 K. This species is significantly more stable than intact water on the clean surface. The stabilization is... (More)
The coadsorption of water and preadsorbed oxygen on Ru{0001) was studied by synchrotron-based high-resolution x-ray photoelectron spectroscopy. A dramatic change was observed in the interaction of water with oxygen between low and high oxygen precoverages. Low oxygen coverages below 0.18 ML induce partial dissociation, which leads to an adsorbed layer of H2O and OH. Around half the oxygen atoms take part in this reaction. All OH recombines upon heating to 200 K and desorbs together with H2O. Oxygen coverages between 0.20 and 0.50 ML inhibit dissociation, instead a highly stable intact water species is observed, which desorbs at 220 K. This species is significantly more stable than intact water on the clean surface. The stabilization is most likely due to the formation of hydrogen bonds with neighboring oxygen atoms. For intermediate oxygen coverages around 0.18 ML, the dissociation behavior depends on the preparation conditions, which points toward possible mechanisms and pathways for partial dissociation of water on Ru{0001}. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
78
issue
3
publisher
American Physical Society
external identifiers
  • wos:000258190300125
  • scopus:46749124280
ISSN
1098-0121
DOI
10.1103/PhysRevB.78.035409
language
English
LU publication?
yes
id
daeb1f8d-2eb2-45f2-a11d-98415899010e (old id 1253269)
date added to LUP
2008-10-31 08:30:11
date last changed
2017-05-21 03:54:34
@article{daeb1f8d-2eb2-45f2-a11d-98415899010e,
  abstract     = {The coadsorption of water and preadsorbed oxygen on Ru{0001) was studied by synchrotron-based high-resolution x-ray photoelectron spectroscopy. A dramatic change was observed in the interaction of water with oxygen between low and high oxygen precoverages. Low oxygen coverages below 0.18 ML induce partial dissociation, which leads to an adsorbed layer of H2O and OH. Around half the oxygen atoms take part in this reaction. All OH recombines upon heating to 200 K and desorbs together with H2O. Oxygen coverages between 0.20 and 0.50 ML inhibit dissociation, instead a highly stable intact water species is observed, which desorbs at 220 K. This species is significantly more stable than intact water on the clean surface. The stabilization is most likely due to the formation of hydrogen bonds with neighboring oxygen atoms. For intermediate oxygen coverages around 0.18 ML, the dissociation behavior depends on the preparation conditions, which points toward possible mechanisms and pathways for partial dissociation of water on Ru{0001}.},
  author       = {Gladys, M. J. and El-Zein, A. A. and Mikkelsen, Anders and Andersen, Jesper N and Held, G.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Modifying the adsorption characteristics of water on Ru{0001} with preadsorbed oxygen},
  url          = {http://dx.doi.org/10.1103/PhysRevB.78.035409},
  volume       = {78},
  year         = {2008},
}