Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Solid-Liquid Interfaces 1: Reactions and Electrochemistry
O 8.1: Topical Talk
Montag, 5. September 2022, 10:30–11:00, S054
Dynamic structure changes of bare and modified Cu(111) during CO and water activation — Andrea Auer1, Nicolas Hörmann2, Mie Andersen3, Karsten Reuter2, and •Julia Kunze-Liebhäuser1 — 1Institute of Physical Chemistry, University of Innsbruck, Austria — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 3Aarhus Institute of Advanced Studies, Denmark
CO is a key intermediate in the electro-oxidation of energy carrying fuels. Single-crystal Cu(111) model catalysts efficiently electro-oxidize CO in alkaline media, under strong and continuous surface structural changes that lead to simultaneous strengthening of the CO and weakening of the OH binding, which makes the observed high activity possible.
Cu(111) modified with Ni(OH)2 and Co(OH)2 reveals strong morphological changes upon adatom deposition, which lead to a significant enhancement in the rate of the alkaline hydrogen evolution reaction (HER), one of the most important processes in the development of hydrogen-based energy conversion devices. Adatom modification influences the charge distribution at the solid/liquid interface by a decrease of the electric field strength negative of the potential of zero charge. This implies an easier reorganization of the interfacial water molecules facilitating charge transfer trough the double layer. The tendency of Cu(111) to restructure is found to dominate its electrochemical properties. The structural changes of the electrode surface are intimately related to the electric field at the solid/liquid interface and to its electrocatalytic activity, in general.