| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5424890 | Surface Science | 2008 | 5 Pages |
Abstract
It is well known that silver segregates to the surface of pure and ideal Pd-Ag alloy surfaces. By first-principles band-structure calculations it is shown in this paper how this may be changed when hydrogen is adsorbed on a Pd-Ag(1Â 1Â 1) surface. Due to hydrogen binding more strongly to palladium than to silver, there is a clear energy gain from a reversal of the surface segregation. Hydrogen-induced segregation may provide a fundamental explanation for the hydrogen or reducing treatments that are required to activate hydrogen-selective membrane or catalyst performance.
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Authors
O.M. Løvvik, Susanne M. Opalka,