Details
| Original language | English |
|---|---|
| Pages (from-to) | 15182-15191 |
| Number of pages | 10 |
| Journal | Journal of Physical Chemistry B |
| Volume | 108 |
| Issue number | 39 |
| Early online date | 28 Aug 2004 |
| Publication status | Published - 1 Sept 2004 |
Abstract
The reversible condensation of potassium into large K + O coadsorption islands that occurs during the O2 + H2 reaction on a Rh(110) surface predosed with potassium has been studied in the 10-7 mbar range at temperatures between 533 and 623 K and with K coverages between 0.025 and 0.11 ML. Scanning photoelectron microscopy has been used as a spatially resolving in situ method to follow the development of the condensation process via calibrated K and O profiles. A Pt patch evaporated onto the Rh(110) surface served as a nucleation center for the reaction fronts. The coadsorbate phases evolving in the course of the condensation were characterized by local photoelectron spectra. Only at high enough temperature (∼580 K) is a nearly complete redistribution of the potassium by reaction fronts observed, whereas at low temperature, a substantial amount of the K + O coadsorbate remains on the reduced surface. The formation of a high-coverage (8 × 2) K + O phase characterized by an energy-shifted component in the Rh 3d and O 1s peaks appears to play a particular role in the condensation process.
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Journal of Physical Chemistry B, Vol. 108, No. 39, 01.09.2004, p. 15182-15191.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Photoelectron spectromicroscopy of potassium redistribution in the O 2 + H2 reaction on Rh(110)
AU - Marbach, H.
AU - Günther, S.
AU - Neubrand, T.
AU - Hoyer, R.
AU - Gregoratti, L.
AU - Kiskinova, M.
AU - Imbihl, R.
PY - 2004/9/1
Y1 - 2004/9/1
N2 - The reversible condensation of potassium into large K + O coadsorption islands that occurs during the O2 + H2 reaction on a Rh(110) surface predosed with potassium has been studied in the 10-7 mbar range at temperatures between 533 and 623 K and with K coverages between 0.025 and 0.11 ML. Scanning photoelectron microscopy has been used as a spatially resolving in situ method to follow the development of the condensation process via calibrated K and O profiles. A Pt patch evaporated onto the Rh(110) surface served as a nucleation center for the reaction fronts. The coadsorbate phases evolving in the course of the condensation were characterized by local photoelectron spectra. Only at high enough temperature (∼580 K) is a nearly complete redistribution of the potassium by reaction fronts observed, whereas at low temperature, a substantial amount of the K + O coadsorbate remains on the reduced surface. The formation of a high-coverage (8 × 2) K + O phase characterized by an energy-shifted component in the Rh 3d and O 1s peaks appears to play a particular role in the condensation process.
AB - The reversible condensation of potassium into large K + O coadsorption islands that occurs during the O2 + H2 reaction on a Rh(110) surface predosed with potassium has been studied in the 10-7 mbar range at temperatures between 533 and 623 K and with K coverages between 0.025 and 0.11 ML. Scanning photoelectron microscopy has been used as a spatially resolving in situ method to follow the development of the condensation process via calibrated K and O profiles. A Pt patch evaporated onto the Rh(110) surface served as a nucleation center for the reaction fronts. The coadsorbate phases evolving in the course of the condensation were characterized by local photoelectron spectra. Only at high enough temperature (∼580 K) is a nearly complete redistribution of the potassium by reaction fronts observed, whereas at low temperature, a substantial amount of the K + O coadsorbate remains on the reduced surface. The formation of a high-coverage (8 × 2) K + O phase characterized by an energy-shifted component in the Rh 3d and O 1s peaks appears to play a particular role in the condensation process.
UR - http://www.scopus.com/inward/record.url?scp=6344244599&partnerID=8YFLogxK
U2 - 10.1021/jp048721y
DO - 10.1021/jp048721y
M3 - Article
AN - SCOPUS:6344244599
VL - 108
SP - 15182
EP - 15191
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 39
ER -