In situ XAFS of acid-resilient iridate pyrochlore oxygen evolution electrocatalysts under operating conditions

David L. Burnett; Enrico Petrucco; Andrea E. Russell; Reza J. Kashtiban; Jonathan D. B Sharman; Richard I. Walton

doi:10.1039/D0CP01378A

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In situ XAFS of acid-resilient iridate pyrochlore oxygen evolution electrocatalysts under operating conditions†

David L. Burnett,

^a Enrico Petrucco,^b Andrea E. Russell,

^c Reza J. Kashtiban,^d Jonathan D. B Sharman^b and Richard I. Walton

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
E-mail: r.i.walton@warwick.ac.uk

^b Johnson Matthey Technology Centre, Blounts Court, Sonning Common, Reading, UK

^c Department of Chemistry, University of Southampton, University Road, Southampton SO17 1BJ, UK

^d Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK

Abstract

Pyrochlore iridates (Na,Ca)_2−xIr₂O₆·H₂O are acid-stable electrocatalysts that are candidates for use in electrolysers and fuel cells. Ir L_III-edge X-ray absorption fine structure spectroscopy in 1 M H₂SO₄ at oxygen evolution conditions suggests the involvement of the electrons from the conduction band of the metallic particles, rather than just surface iridium reacting.

This article is part of the themed collection: Synchrotron Radiation Techniques in Catalytic Science

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DOI: https://doi.org/10.1039/D0CP01378A
Article type: Communication
Submitted: 11 Mar 2020
Accepted: 22 Apr 2020
First published: 18 May 2020
This article is Open Access

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Phys. Chem. Chem. Phys., 2020,22, 18770-18773

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In situ XAFS of acid-resilient iridate pyrochlore oxygen evolution electrocatalysts under operating conditions

D. L. Burnett, E. Petrucco, A. E. Russell, R. J. Kashtiban, J. D. B. Sharman and R. I. Walton, Phys. Chem. Chem. Phys., 2020, 22, 18770 DOI: 10.1039/D0CP01378A

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Physical Chemistry Chemical Physics

In situ XAFS of acid-resilient iridate pyrochlore oxygen evolution electrocatalysts under operating conditions†

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In situ XAFS of acid-resilient iridate pyrochlore oxygen evolution electrocatalysts under operating conditions

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