Abstract
The reduction of a thin surface oxide on the Rh(1 1 1) surface by CO is studied in situ by photoemission spectroscopy, scanning tunneling microscopy, and density functional theory. CO molecules are found not to adsorb on the surface oxide at a sample temperature of 100 K, in contrast to on the clean and chemisorbed oxygen covered surface. Despite this behavior, the surface oxide may still be reduced by CO, albeit in a significantly different fashion as compared to the reduction of a phase containing only chemisorbed on surface oxygen. The experimental observations combined with theoretical considerations concerning the stability of the surface oxide, result in a model of the reduction process at these pressures suggesting that the surface oxide behaves as a source of oxygen for the CO-oxidation reaction.
Original language | English |
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Pages (from-to) | 367-372 |
Journal | Journal of Electron Spectroscopy and Related Phenomena |
Volume | 144-147 |
DOIs | |
Publication status | Published - 2005 |
Subject classification (UKÄ)
- Atom and Molecular Physics and Optics
Free keywords
- O
- Rh
- STM
- PES
- DFR
- CO