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

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

Phys Chem Chem Phys. 2020 Sep 14;22(34):18770-18773. doi: 10.1039/d0cp01378a. Epub 2020 May 18.

Authors

David L Burnett¹, Enrico Petrucco, Andrea E Russell, Reza J Kashtiban, Jonathan D B Sharman, Richard I Walton

Affiliation

¹ Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK. r.i.walton@warwick.ac.uk.

PMID: 32421133
DOI: 10.1039/d0cp01378a

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.