Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Heterogeneous catalysis
O 45.9: Vortrag
Donnerstag, 26. März 2009, 12:30–12:45, SCH A215
Reactivity of Hydrogen Related Reactions of Platinum Nanoparticles on Graphite — •Tine Brülle1, Holger Wolfschmidt1, and Ulrich Stimming1,2 — 1Department of Physics E19, Technische Universität München, James-Franck-Straße 1, D-85748 Garching, Germany — 2Bavarian Center for Applied Energy Research (ZAE Bayern) Division 1, Walter-Meißner-Straße 6, D-85748 Garching, Germany
A present challenge in electrocatalysis is to identify novel, highly active catalysts. Former experimental investigations of the systems Pd/Au(111) [1,2] and Pt/Au(111) [3,4] show that with decreasing amount of the catalyst material the specific catalytic activity increases considerably with respect to hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER). In order to improve the understanding of such an enhanced catalytic activity, hydrogen based reactions were investigated for platinum supported on HOPG (highly oriented pyrolytic graphite). For that purpose, the HOPG surface was structured with nanoparticles of platinum using electrochemical pulse techniques. First results on the catalytic activity of Pt/HOPG regarding HOR and HER are presented and compared to the results of the bimetallic systems Pd/Au(111) and Pt/Au(111).
[1] Kibler, L. A. ChemPhysChem 7 (2006) 985 [2] Pandelov, S.; Stimming, U. Electrochimica Acta 2007, 52, 5548 [3] Wolfschmidt, H.; Bußar, R.; Stimming, U. J. Phys. Condens. Matter, 2008, 20/37, 374127 [4] Wolfschmidt, H.; Bußar, R.; Stimming, U. submitted for publication