SKM 2023 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Optical Analysis of Thin Films III

DS 17.1: Hauptvortrag

Donnerstag, 30. März 2023, 16:15–16:45, SCH A 316

In-situ optical spectroscopy on electrochemical interfaces: From OER electrocatalysts to "smart" electro-switchable interfaces — •Martin Rabe — Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf

We employ electrochemical in-situ optical spectroscopies, namely IR- and Raman-spectroscopy as well as UV/vis-spectroscopic ellipsometry to understand fundamental processes at electrolyte/solid interfaces. Here, different examples from our research will be presented and discussed. 1: Electrocatalytically active manganese and nickel oxides during the anodic oxygen evolution reaction (OER) were studied. The formation, phase transitions and dissolution processes in these metal oxides is shown to govern their activity and stabilities on metallic electrodes. These material properties play a major role for the improvement of electrocatalysts for the sluggish OER in hydrogen production by the electrochemical water splitting. 2: The impact of the electrochemical Ge-OH to Ge-H surface termination on germanium interfaces was studied, which is accompanied by a switching of the interface hydrophobicity. The formation of a hydrophobic gap at semiconductor/electrolyte interface gives access to study fundamental properties of the water solvation layers. Furthermore, it is shown how the macroscopic change of the hydrophobicity can be employed as a "smart" electro-switchable surface that allows to reversibly control the adsorption and orientation of bio-macromolecules, a process that is potentially useful for novel bio sensing applications.