Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.210
Publication date: 18th December 2023
An in depth understanding of the atomistic mechanism underlying different electrochemical processes requires recording large sets of data under operando conditions yielding key information of the electrified interface. Thus, the desired parameters to be known include the chemical composition at the interface, chemical states of the atoms and their variation as a result of the electrochemical reactions as well as the structural evolution. Unfortunately the analytical techniques able to provide interface information are very limited and hardly compatible with liquids allowing usually only ex situ characterizations leading to a loss of important information as in many cases the intermediates and electrocatalytic actives species cannot be “quenched” in post process analysis. X-ray spectroscopy techniques are able to provide relevant information of the electronic structure in an element specific manner but real electrochemical interfaces are buried and most of the time in presence of liquid electrolytes being inaccessible directly to the common electron based surface sensitive techniques. Recently new approaches were developed allowing the investigation of the electronic structure variation of the electrocatalysts under reaction conditions using photoelectron spectroscopy, from gas phase up to bulk aqueous electrolyte. These experimental setups based in photoelectron spectroscopy were used, among others, to investigated the not kinetically favored oxygen evolution reaction onto IrOx catalysts, which is the example used in this talk.
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