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EnglishThe changes in the surface composition of a Pt50Rh50(100) alloy due to an ongoing 2H2 + O2f2H2O chemical reaction have been studied in situ. Exploiting the high-energy resolution and surface sensitivity of synchrotron radiation core-level spectroscopy it was possible to monitor the population of the two transitions metals atoms at the gas-surface interface. Sequences of fast high-resolution core-level spectra of the Rh3d5/2, Pt4f7/2, and O1s core levels showed a continuous exchange of atoms between the first and subsurface layers. An unexpected Pt surface enrichement was found under slightly oxidizing conditions, opposite to what found in a highly oxidizing atmosphere.
http://hdl.handle.net/11368/1691699| Titolo: | Unexpected Behaviour of the Surface Composition of PtRh Alloys During Chemical Reaction |
| Autori interni: | BARALDI, Alessandro COMELLI, GIOVANNI ROSEI, RENZO |
| Data di pubblicazione: | 2005 |
| Rivista: | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY |
| Abstract: | The changes in the surface composition of a Pt50Rh50(100) alloy due to an ongoing 2H2 + O2f2H2O chemical reaction have been studied in situ. Exploiting the high-energy resolution and surface sensitivity of synchrotron radiation core-level spectroscopy it was possible to monitor the population of the two transitions metals atoms at the gas-surface interface. Sequences of fast high-resolution core-level spectra of the Rh3d5/2, Pt4f7/2, and O1s core levels showed a continuous exchange of atoms between the first and subsurface layers. An unexpected Pt surface enrichement was found under slightly oxidizing conditions, opposite to what found in a highly oxidizing atmosphere. |
| Handle: | http://hdl.handle.net/11368/1691699 |
| Digital Object Identifier (DOI): | 10.1021/ja044372+ |
| URL: | http://pubs.acs.org/doi/abs/10.1021/ja044372%2B?prevSearch=%255BContrib%253A%2Bbaraldi%255D&searchHistoryKey= |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
