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O: Oberflächenphysik
O 13: Solid-liquid interfaces
O 13.4: Talk
Monday, March 27, 2006, 15:45–16:00, WIL C207
ATR-IR spectroscopic measurements of cooperative effects during CO electro-oxidation on Pt film electrodes — •Johannes Bolten1, Antoine Bonnefont2, Sauradip Malkhandi1, and Katharina Krischer1 — 1Physik Department E19, Technische Universität München, James Franck Str. 1, 85748 Garching — 2Université Louis Pasteur, 4 rue Blaise Pascal, 67070 Strasbourg Cedex, France
Attenuated total reflection infrared (ATR-IR) spectroscopy allows the in-situ observation of surface coverages under reaction conditions. When combined with a flow cell, adsorbate coverages under stationary conditions can be monitored. Employing ATR-IR spectroscopy in a flow-cell, we present studies on nonlinear phenomena during CO electro-oxidation on Pt film electrodes. In particular, we investigate the dynamics in the bistable and oscillatory regime of this reaction. The studies allow us to draw conclusions on the physico-chemical mechanism of the oscillations. Moreover, simultaneous measurements of CO and anion coverages make it possible to analyze the adsorption dynamics in the presence of both species, allowing to detect cooperative effects.