Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 6: Grenzfl
äche fest-flüssig
O 6.7: Vortrag
Freitag, 4. März 2005, 12:15–12:30, TU EB407
Catalysis of CO and H2 electrooxidation on UHV prepared PtAu/Ru(0001) model surfaces — •H.E. Hoster, E. Filonenko, and R.J. Behm — Abteilung Oberflächenchemie und Katalyse, Universität Ulm, 89069 Ulm
Utilizing an electrochemical flow cell setup for single crystals we have evaluated the electrocatalytic activity of a series of PtAu model electrodes for CO oxidation and H2 oxidation/evolution. The electrodes consist of PtAu monolayers of varying compositions on a Ru(0001) substrate and Au-decorated Pt/Ru(0001) submonolayer structures. The surfaces were prepared under UHV conditions, and their morphology and distribution of surface atoms was quantitatively determined by STM [1]. The variation of the catalytic activity is quantitatively related to the distribution of surface atoms in order to evaluate the activity of atomic ensembles. The influence of Au decoration on the activity of Ru and Pt steps in bimetallic Pt/Ru(0001) surfaces is tested and discussed. [1] E. Filonenko, H.Hoster, H.Rauscher, R.J. Behm, ’Zweidimensionale Legierungsbildung in PtAu Monolagenschichten’, pesented at this conference