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Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 10: Solid-liquid Interfaces I

O 10.3: Talk

Monday, March 31, 2014, 11:00–11:15, WIL A317

Photoelectrochemical CO2 reduction on silicon electrodes functionalized with pyridine — •Qi Li1, Sebastian Lindner1, Anton Tosolini1, Katrin Bickel1, Simon Filser1, Konrad Schönleber1, Ignaz Höhlein2, Bernhard Rieger2, Irene Grill3, Regina Wyrwich3, Joost Wintterlin3, and Katharina Krischer11Nonequilibrium Chemical Physics, Physics Department, Technical University Munich, Germany — 2WACKER-Lehrstuhl für Makromolekulare Chemie, Chemistry Department, Technical University Munich, Germany — 3Chemistry Department, Ludwig-Maximilians-Universität Munich, Germany

Solar driven CO2 conversion to fuels or basic chemicals could provide an exciting new energy storage pathway. Attempts of creating such a photochemical solar cell have to deal with the large activation barrier of CO2 reduction which leads to low yields and efficiencies. Bocarsly et al. reported that in the presence of dissolved pyridine, CO2 can be electrochemically reduced to methanol at illuminated p-GaP electrodes at a comparably low overpotential [1]. We demonstrate that a functionalized p-Si electrode constitutes a promising interface for CO2 reduction. The interface consists of pyridine molecules which are immobilized via an electrografting process to the Si-surface. Modified electrodes have been characterized using electrochemical methods and XPS. Besides its protective attributes against surface oxidation, the pyridine layer on top of the p-Si electrode shows increased electrochemical reactivity towards CO2 reduction. [1] E. Barton, D. Rampulla, A. B. Bocarsly; J. Am. Chem. Soc., 2008, 130, 6342-6344

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