PtxRu1−x/Ru(0001) surface alloys—formation and atom distribution
- 3 April 2008
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 10 (25), 3812-3823
- https://doi.org/10.1039/b802169d
Abstract
The formation of PtRu surface alloys by deposition of submonolayer Pt films on a Ru(0001) substrate and subsequent annealing to about 1350 K and the distribution of the Pt atoms in the surface layer were investigated by scanning tunneling microscopy. Quantitative statistical analysis reveals (i) negligible losses of Pt into subsurface regions up to coverages close below 1 monolayer, (ii) a homogeneous distribution of the Pt atoms over the surface, and (iii) the absence of a distinct long-range or short-range order in the surface layer. In addition, the density of specific adsorption ensembles is analyzed as a function of Pt surface content. Possible conclusions on the process for surface alloy formation are discussed. The results are compared with the properties of PtRu bulk alloys and the findings in previous adsorption studies on similar surface alloys (H. Rauscher, T. Hager, T. Diemant, H. Hoster, F. Bautier de Mongeot and R. J. Behm, Surf. Sci., 2007, 601, 4608; T. Diemant, H Rauscher and R. J. Behm, J. Phys. Chem. C, in press).Keywords
This publication has 73 references indexed in Scilit:
- Periodic Density Functional Study of CO and OH Adsorption on Pt−Ru Alloy Surfaces: Implications for CO Tolerant Fuel Cell CatalystsThe Journal of Physical Chemistry B, 2001
- The Role of Atomic Ensembles in the Reactivity of Bimetallic ElectrocatalystsScience, 2001
- Effect of Strain on the Reactivity of Metal SurfacesPhysical Review Letters, 1998
- CO adsorption and oxidation on bimetallic Pt/Ru(0001) surfaces – a combined STM and TPD/TPR studySurface Science, 1998
- Scanning tunneling microscopy of binary-alloy surfaces: is chemical contrast a consequence of alloying?Surface Science, 1998
- Direct observation of surface chemical order by scanning tunneling microscopyPhysical Review Letters, 1993
- Alloy formation energetics and dynamics in the Ni/Cu(100) and Ni/Cu(111) systemsJournal of Vacuum Science & Technology A, 1992
- Bimetallic Surface ChemistryAnnual Review of Physical Chemistry, 1990
- Influence of ensemble size on CO chemisorption and catalytic n-hexane conversion by Au-Pt(111) bimetallic single-crystal surfacesJournal of Catalysis, 1983
- Infrared spectra of carbon monoxide adsorbed on supported palladium and palladium-silver alloysJournal of Catalysis, 1974