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O: Fachverband Oberflächenphysik

O 67: Metal surfaces: Adsorption of H/O and inorganic molecules

O 67.8: Vortrag

Donnerstag, 29. März 2012, 12:15–12:30, MA 043

Coadsorption of deuterium and CO on PtRu/Ru(0001) model surfaces - The influence of surface structure — •Thomas Diemant, Heinrich Hartmann, Joachim Bansmann, and Rolf Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany

The study of the interaction of hydrogen (deuterium) and/or CO with bimetallic PtRu surfaces is of high interest for an improved understanding of the chemistry of low temperature Polymer Electrolyte (PE) fuel cells. Studies with structurally well-defined model surfaces can contribute significantly in this respect. In our study, we used PtRu/Ru(0001) model surfaces of two distinct structural configurations: (i) monolayer Pt islands on a Ru(0001) substrate and (ii) PtRu/Ru(0001) surface alloys with almost random distribution of the two metal components in the surface layer. We studied the coadsorption of deuterium and CO on these bimetallic model surfaces using temperature-programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS). We will show how the adsorption properties of both species are affected by the deposition of Pt, the metal distribution in the surface and the presence of the co-adsorbed species.