Regensburg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 15: Solid-Liquid Interfaces 2: Structure and Spectroscopy

O 15.9: Vortrag

Montag, 5. September 2022, 17:15–17:30, S054

In-situ electrochemical X-ray photoelectron spectroscopy as laboratory technique to study the electrified interface — •Christoph Griesser, Daniel Winkler, Toni Moser, and Julia Kunze-Liebhäuser — Department of Physical Chemistry, University of Innsbruck, Innrain 52c, Innsbruck, Austria

The interface between a charged metal and an aqueous electrolyte is the most commonly studied in electrochemical surface science, as its properties determine the reactivity of many systems relevant for technological applications. More specifically, in the electrocatalytic conversion of energy, the activity, selectivity and efficiency are determined by the charge transfer between electrolyte and electrode, which is governed by the interfacial properties of the system. Therefore, a fundamental understanding of the interplay between applied potential and surface/interface chemistry is pivotal to further advance energy conversion and storage technologies. While there are several in-situ methods, to characterize the surface structure under reaction conditions, the surface chemistry (i.e. the elemental composition of the surface and the oxidation state of the components) itself is still most often investigated via ex-situ X-ray photoelectron spectroscopy (XPS). This work presents first in situ electrochemical XPS results obtained with a laboratory near ambient pressure (NAP-) XPS system. We show, that it is possible to track the oxidation state of a bulk gold (Au) electrode under reaction conditions, i.e. during anodic oxidation.