Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.42: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Surface Structure and Morphology of Cu–free and Cu–covered Au(1 0 0) and Au(1 1 1) Electrodes in Alkaline Solution — •Christian Schlaup¹, Daniel Friebel², and Klaus Wandelt³ — ¹Technical University of Denmark, Department of Physics, Fysikvey, DK–2800 Kongens Lyngby, Denmark — ²Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, CA 94025, USA — ³University of Bonn, Institute for Physical und Theoretical Chemistry, Wegelerstr. 12, D–53115 Bonn, Germany

For both Cu–free Au-electrodes three different phases were observed as a function of the applied electrode potential. While at low potentials the onset of surface reconstruction points towards an apparently adsorbate free surface and, thus, a weak interaction with species from the electrolyte, a Au–hydroxide and a Au–oxide phase are formed subsequently during potential increase.

A similar phase behavior was also found for Cu–covered Au–electrodes, while at low potentials an apparently adsorbate free Cu layer is observed, a Cu–hydroxide coadsorbate phase and a Cu–oxide phase are formed under increased potential conditions. In addition the apparently adsorbate free Cu–film tends to form a Cu–Au alloy phase while keeping the electrode for a sufficient long time at low potential conditions.