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Keynote Lecture

X-Ray spectroscopic tools for redox process in complex oxides

Wednesday (23.09.2020)
15:40 - 16:10 Z: Special Symposia I
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Many functional materials owe their properties and utility to the ability to undergo or facilitate redox processes. Especially in solid state and interfacial electrochemistry, charge transfer via electrons or ions take place. In order to achieve a thorough understanding of these processes and attain meaningful structure-property-utility relationships that may guide rational materials design, direct probes of the chemistry and electronic structure are necessary. X-Ray spectroscopic methods are one of the most direct ways of probing electrons in a material, and have become available to operate at both decreasing length scales and realistic thermodynamic and electrochemical conditions. Important mechanistical insights have thus been gathered
In this presentation, we will give an overview of the utility of X-Ray spectroscopic methods in materials science, showcasing solid oxides which are used in fuel cells, electrolyzers, membranes, and other electrochemical applications. We will show how in situ and laterally resolved X-Ray absorption and photoemission spectroscopy can provide information far beyond a simplistic ionic picture, elucidating peculiar percolation conduction mechanisms in mixed conducting oxide perovskites, nanoscopic magnetic field and annealing effects on catalyst materials and identification of active components in intercalation electrodes.

Speaker:
Dr. David Mueller
Forschungszentrum Jülich GmbH