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Water-Splitting Electrocatalysis in Acid Conditions Using Ruthenate-Iridate Pyrochlores

DOI: 10.1002/ange.201406668 DOI Help

Authors: Kripasindhu Sardar (University of Warwick) , Enrico Petrucco (Johnson Matthey Fuel Cells) , Craig Hiley (University of Warwick) , Jonathan D. B. Sharman (Johnson Matthey Technology Centre) , Peter Wells (Rutherford Appleton Laboratory) , Andrea Russell (University of Southampton) , Reza J. Kashtiban (University of Warwick) , Jeremy Sloan (University of Warwick) , Richard Walton (University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie , VOL 126 , PAGES 11140 - 11144

State: Published (Approved)
Published: October 2014
Diamond Proposal Number(s): 7646

Abstract: The pyrochlore solid solution containing B-site RuIV and IrIV is prepared by hydrothermal synthesis and used as a catalyst layer for electrochemical oxygen evolution from water at pH<7. The materials have atomically mixed Ru and Ir and their nanocrystalline form allows effective fabrication of electrode coatings with improved charge densities over a typical (Ru,Ir)O2 catalyst. An insitu study of the catalyst layers using XANES spectroscopy at the Ir LIII and Ru K edges shows that both Ru and Ir participate in redox chemistry at oxygen evolution conditions and that Ru is more active than Ir, being oxidized by almost one oxidation state at maximum applied potential, with no evidence for ruthenate or iridate in +6 or higher oxidation states.

Subject Areas: Chemistry

Instruments: B18-Core EXAFS