Work

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

Year: 2014

Type: article

Abstract: The pyrochlore solid solution (Na(0.33)Ce(0.67))2(Ir(1-x)Ru(x))2O7 (0≤x≤1), containing B-site Ru(IV) and Ir(IV) 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 in situ study of the catalyst layers using XANES spectroscopy at the Ir L(III) 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.

Source: Angewandte Chemie International Edition

DOI: 10.1002/anie.201406668

Authors: Kripasindhu Sardar, Enrico Petrucco, Craig I. Hiley, Jonathan D. B. Sharman, Peter P. Wells, Andrea E. Russell, Reza J. Kashtiban, Jeremy Sloan, Richard I. Walton

Institutions: University of Warwick, Johnson Matthey (United Kingdom), Rutherford Appleton Laboratory, Research Complex at Harwell, University of Southampton

Language: English

Topic: Electrocatalysts for Energy Conversion

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

Open Access status: bronze

Funders: Diamond Light Source, Advantage West Midlands, University of Southampton, University of Warwick, Engineering and Physical Sciences Research Council, European Regional Development Fund

OpenAlex ID: W2019336596

FWCI: 3.807

Cites: 32

Cited by: 268

Related to: 10