Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Dielectric and Molecular/Water Interfaces

O 60.11: Vortrag

Mittwoch, 18. März 2015, 17:30–17:45, MA 043

Photoelectrochemical CO₂ reduction on silicon electrodes functionalized with pyridine — •Qi Li¹, Sebastian Lindner¹, Anton Tosolini¹, Manuel Windscheid¹, Katrin Bickel¹, Simon Filser¹, Konrad Schönleber¹, Ignaz Höhlein², Bernhard Rieger², Patrick Zeller³, Joost Wintterlin³ und Katharina Krischer¹ — ¹Nonequilibrium Chemical Physics, Physics Department, Technical University Munich, Germany — ²WACKER-Chair for Macromolecular Chemistry, Chemistry Department, Technical University Munich, Germany — ³AK Wintterlin, Chemistry Department, Ludwig-Maximilians-University Munich, Germany

Solar driven CO₂ reduction to fuels or basic chemicals could provide an exciting new energy conversion pathway. Attempts of creating such a photochemical solar cell have to deal with the large activation barrier of CO₂ reduction which tends to lead to low yields and efficiencies.
Based on the reported catalytic effects of dissolved pyridine on the CO₂ reduction [1,2] we demonstrate that a functionalized p-Si electrode constitutes a promising interface for the photoelectrochemical CO₂ reduction. The interface consists of pyridine molecules which are immobilized on the Si surface via an electrografting process [3]. Modified electrodes have been characterized using electrochemical methods, STM and XPS. The grafted pyridine layer noticeably increases the electrochemical reactivity of the p-Si electrode.
Barton et al., J. Am. Chem. Soc., 2008, 130, 6342-6344 [2] Keets et al., Indian J. Chem., 2012, 51A, 1284-1297 [3] Li et al., Surf. Sci., 2015, 631, 185-189