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O: Fachverband Oberflächenphysik
O 45: Solid-Liquid Interfaces II: Reactions and Electrochemistry
O 45.4: Vortrag
Dienstag, 17. März 2020, 11:30–11:45, WIL C107
In-situ STM imaging of self-activated CO oxidation on Cu(111) electrocatalysts — Andrea Auer1, Eva-Maria Wernig1, Xing Ding2, Aliaksandr Bandarenka2, Nicolas Hörmann3, Karsten Reuter3, and •Julia Kunze-Liebhäuser1 — 1Institute of Physical Chemistry, University of Innsbruck, Innsbruck, Austria — 2Physics of Energy Conversion and Storage, Technische Universität München, Garching, Germany — 3Theoretical Chemistry, Technische Universität München, Garching, Germany
Carbon monoxide (CO) is a key intermediate in the electro-oxidation of energy carrying fuels. In this work, the ability of Cu(111) single crystals to electrochemically oxidize CO at low overpotentials is reported. In-situ infrared spectroscopy confirms weak adsorption of CO on Cu(111) as well as its oxidation to CO2. Electrochemical scanning tunneling microscopy (EC-STM) reveals that during CO oxidation the Cu(111) surface reconstructs and concomitantly adsorbs OH, while forming low-dimensional Cu nanostructures that are effectively stabilized through the presence of CO. Therefore, CO itself activates the (111) surface of Cu and enhances its own oxidation. The potential of maximum entropy which is closely associated with the potential of zero charge (pzc) has been determined for Cu(111) and correlated with the corresponding surface structures through EC-STM studies. In combination with DFT calculations that include the effects of applied potential and the solvent environment, this helps to achieve a true atomistic understanding of the interfacial structures and the electrocatalytic activity.