Volume 59, Issue 36 pp. 15314-15324
Minireview

Advances in Understanding Mechanisms of Perovskites and Pyrochlores as Electrocatalysts using In-Situ X-ray Absorption Spectroscopy

Dr. Joohyuk Park

Dr. Joohyuk Park

Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

Present address: Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH UK

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Prof. Jaephil Cho

Corresponding Author

Prof. Jaephil Cho

Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

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First published: 27 February 2020
Citations: 28

Graphical Abstract

Ray of light: In-situ X-ray absorption spectroscopy methods for electrochemical tests have been developed to follow the changes of electron configurations and geometric local structures of metal oxides during electrocatalysis. This Minireview gives a brief introduction to recent progress in understanding catalytic mechanisms of perovskite and pyrochlore oxides by using this method.

Abstract

Metal oxides are some of the most promising candidates as electrocatalysts for electrical-energy-storage (EES) systems. Particularly, perovskite and pyrochlore oxides have been intensively investigated as bifunctional electrocatalysts because of their superior catalytic activities during the oxygen-reduction and -evolution reactions. However, the origin of the outstanding catalytic activities and structural changes of the materials are not clear, in part due to the difficulty in identification during electrocatalysis. In this Minireview, we present a critical overview of recent progress in understanding catalytic mechanisms of perovskite and pyrochlore oxides, highlighting the innovative in-situ X-ray absorption spectroscopy (XAS) analysis for electrochemical tests.

Conflict of interest

The authors declare no conflict of interest.

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