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Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Solid-Liquid Interfaces 1: Reactions and Electrochemistry

O 8.2: Vortrag

Montag, 5. September 2022, 11:00–11:15, S054

Cu(111) reconstruction and oxidation imaged in oxygen free alkaline media with electrochemical scanning tunneling microscopy — •Toni Moser, Andrea Auer, and Julia Kunze-Liebhäuser — Department of Physical Chemistry, University of Innsbruck, Innrain 52c, Innsbruck, Austria

Cu has recently gained attention due to its capability to efficiently oxidize CO at low overpotentials[1]. However, the structural evolution of the surface at anodic potentials causing initiation of oxide formation under complete exclusion of oxygen has yet to be fully understood. While Cu(111) oxidation has previously been studied with electrochemical scanning tunneling microscopy (EC-STM), investigations without atmospheric oxygen and without contamination from dissolved glassware in alkaline media are sparse. Recent results indicate a significant delay in the anodic formation of Cu2O in completely deaerated alkaline electrolyte, which indicates a significant impact of dissolved O2 on the oxidation of copper surfaces. In this work, we focus on the in-situ investigation of hydroxide adsorption on and oxidation of Cu(111) via EC-STM, eliminating atmospheric oxygen by conducting the experiments inside an Ar-filled glove box. The delayed formation of an amorphous oxide layer at anodic potentials and subsequent reduction processes at cathodic potentials, where a smoothening of the surface can be observed, as well as new insights into the hydroxide adsorption structure are presented.

[1] A. Auer, M. Andersen, E.-M. Wernig, N. G. Hörmann, N. Buller, K. Reuter & J. Kunze-Liebhäuser, Nat Catal 3, 797-803 (2020).

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