Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 2: Metal substrates: Solid-liquid interfaces

O 2.7: Vortrag

Montag, 22. März 2010, 12:45–13:00, H31

Simulating cyclic voltammograms of bimetallic model surfaces — •Harry E. Hoster, Otavio B. Alves, Albert K. Engstfeld, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany

Cyclic voltammograms recorded at bimetallic surfaces reflect the superposition of current contributions from adsorption, desorption, and reaction processes at surface regions with laterally varying chemical properties. As will be demonstrated for some selected well-defined single crystalline model systems including Pt films on Ru(0001) and PtAu/Pt(111) surface alloys, voltammetric features at bimetallic surfaces can be simulated using the corresponding features for the monometallic surfaces in combination with information on the adsorption properties and abundance of the dominating sites at the bimetallic surfaces. Trends in the local adsorption properties can be predicted based on density functional theory calculations, whereas the necessary information about the local vertical and lateral metal distribution is obtained from scanning tunnelling microscopy imaging.