Abstract
The adsorption properties of structurally well-defined bimetallic PtAu/Pt(111) monolayer surface alloys, with known lateral distribution of the respective surface species and varied Au surface contents, were studied by temperature-programmed desorption (TPD) and infrared reflection–absorption spectroscopy (IRAS), using CO as probe molecule. The surface composition and the lateral distribution of surface atoms in the PtAu/Pt(111) surface alloys were previously determined by high-resolution scanning tunneling microscopy (STM) [Bergbreiter, A.; et al. ChemPhysChem 2010, 11, 1505], showing a tendency for lateral segregation of both metals in the surface layer. CO adsorption on these surfaces is dominated by adsorption on Pt on-top sites; the fraction of bridge-bonded COad decays rapidly with increasing Au surface content and is completely absent for surfaces with 35% and more surface Au content. Adsorption on Au sites is negligible at 100 K. The roles of electronic ligand and strain effects and of geometric e...
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