Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Solid/liquid interfaces I (focussed session)
O 64.7: Vortrag
Donnerstag, 25. März 2010, 12:45–13:00, H33
Preparation, characterization and reactivity of sub-monolayers of platinum on carbon based model surfaces — •Tine Brülle1 and Ulrich Stimming1,2 — 1Technische Universität München, Department of Physics E19, James-Franck-Str. 1, D-85748 Garching, Germany — 2Bavarian Center for Applied Energy Research (ZAE Bayern) Division 1 Walther-Meißner-Strasse 6, D-85748, Germany
In connection with fuel cell related research, catalyst nanoparticles on porous carbon supports got into the focus of attention. However, the complex morphology of these technical catalysts makes a thorough understanding of the influence of parameters such as noble metal particle size and morphology as well as particle distance on reactivity rather difficult. Therefore, we aim at a better understanding of these effects by using nanostructured flat surfaces as model systems in our investigations. Platinum nanoparticles supported on HOPG (highly oriented pyrolytic graphite) were prepared. This crystalline form of carbon provides a well-defined support regarding geometric and electronic structure. The platinum nanostructured surfaces were used to investigate catalytic properties for hydrogen related reactions.
Another form of crystalline carbon is diamond. High doping rates cause a sufficient electronic conductivity that make electrochemical measurements possible, while the very flat surfaces diamond monocrystals make imaging of metal nanoparticles via SPM-methods possible. Preliminary results on platinum nanostructured diamond surfaces will be shown.