Understanding electrochemical switchability of perovskite-type exsolution catalysts

Alexander K. Opitz (), Andreas Nenning, Vedran Vonk, Sergey Volkov, Florian Bertram, Harald Summerer, Sabine Schwarz, Andreas Steiger-Thirsfeld, Johannes Bernardi, Andreas Stierle and Jürgen Fleig
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Alexander K. Opitz: Institute of Chemical Technologies and Analytics
Andreas Nenning: Institute of Chemical Technologies and Analytics
Vedran Vonk: Deutsches Elektronen-Synchrotron (DESY)
Sergey Volkov: Deutsches Elektronen-Synchrotron (DESY)
Florian Bertram: Deutsches Elektronen-Synchrotron (DESY)
Harald Summerer: Institute of Chemical Technologies and Analytics
Sabine Schwarz: University Service Centre for Transmission Electron Microscopy (USTEM)
Andreas Steiger-Thirsfeld: University Service Centre for Transmission Electron Microscopy (USTEM)
Johannes Bernardi: University Service Centre for Transmission Electron Microscopy (USTEM)
Andreas Stierle: Deutsches Elektronen-Synchrotron (DESY)
Jürgen Fleig: Institute of Chemical Technologies and Analytics

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Exsolution of metal nanoparticles from perovskite-type oxides is a very promising approach to obtain catalysts with superior properties. One particularly interesting property of exsolution catalysts is the possibility of electrochemical switching between different activity states. In this work, synchrotron-based in-situ X-ray diffraction experiments on electrochemically polarized La0.6Sr0.4FeO3-δ thin film electrodes are performed, in order to simultaneously obtain insights into the phase composition and the catalytic activity of the electrode surface. This shows that reversible electrochemical switching between a high and low activity state is accompanied by a phase change of exsolved particles between metallic α-­Fe and Fe-oxides. Reintegration of iron into the perovskite lattice is thus not required for obtaining a switchable catalyst, making this process especially interesting for intermediate temperature applications. These measurements also reveal how metallic particles on La0.6Sr0.4FeO3-δ electrodes affect the H2 oxidation and H2O splitting mechanism and why the particle size plays a minor role.

Date: 2020
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DOI: 10.1038/s41467-020-18563-w

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