Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.87: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Nanostructuring of Cu Planar Surfaces With Pt For The Investigation of Hydrogen Related Reactions — •Odysseas Paschos1, Holger Wolfschmidt1, Rainer Bußar1,2, and Ulrich Stimming1,2 — 1Department of Physics E19, Technische Universität München, James-Franck-Str. 1,85748, Garching, Germany — 2Bavarian Center for Applied Energy Research (ZAE Bayern), Walther-Meißner Str. 6, 85748, Garching, Germany
Recent advances in electrochemistry show that nanostructuring surfaces with metallic catalysts can enhance their electrocatalytic activity. This is advantageous for various applications such as fuel cells and electrolyzers, since it can improve their performance with simultaneous decrease in the amount of precious metal catalysts that is used. Previous work on Pd decorated Au(111) surfaces showed that by decreasing the Pd amount on Au(111), an increase of the activity for hydrogen evolution reaction (HER) occurred for very small coverages. A similar trend was observed for the case of Pt nanostructured Au(111) surfaces. However more research needs to be done in order to obtain a better understanding of this effect. The choice of the substrate material is an important factor for the design of the catalyst structure. In this work we will present results on hydrogen related reactions for Pt nanostructured Cu surfaces. Pt deposited on Cu results in a compressed lattice of Pt and hence the electrochemical behavior of the catalyst system is altered compared to bulk Pt and Pt deposited on Au(111). The results will be compared to the Pt/Au(111) system and hence useful conclusions can be drawn for the choice of substrate material.