Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.4: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

EC-STM study of the influence of gas adsorbates on the structure and morphology of Cu-monolayers on Au(1 1 1) and Pt(1 1 1) electrodes — •Christian Schlaup and Sebastian Horch — Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark (DTU), DK–2800 Kongens Lyngby, Denmark

The electrodeposition of metals adlayers in general, and the underpotential deposition (upd) of metal (sub)monolayers in particular, is a major topic in interfacial electrochemistry and has been studied extensively. Often a strong dependence of the atomic structure of such metal upd layers on both, the substrate and the involved anionic species in the deposition electrolyte, was found.
In the present work, we studied the influence of neutral gas coadsorbates, such as dissolved CO₂ and CO, on the structure and morphology of Cu-upd layers on Au(1 1 1) and Pt(1 1 1) electrodes by means of cyclic voltammetry and EC-STM. Contrary to the case of purely anionic adsorbates, these gas adsorbates may not only influence the structure of the metal upd layer directly by coadsorption, but also indirectly due to attractive interactions with the underlying substrate. In order to be able to distinguish between these effects, we studied both, the Cu deposition in presence of gas adsorbates and the reaction of Cu-films on the introduction of gas adsorbates after their deposition from a blank electrolyte.