Water-splitting electrocatalysis in acid conditions using ruthenate-iridate pyrochlores
Water-splitting electrocatalysis in acid conditions using ruthenate-iridate pyrochlores
The pyrochlore solid solution (Na0.33Ce0.67)(2)-(Ir1-xRux)(2)O-7 (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)O-2 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.
11140-11144
Sardar, Kripasindhu
6e1c0d9e-7c4a-4d63-9ae5-78d8e368c457
Petrucco, Enrico
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Hiley, Craig I.
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Sharman, Jonathan D.B.
99568bba-42d3-40a1-9258-aabe348b8f2d
Wells, Peter P.
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Russell, Andrea E.
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Kashtiban, Reza J.
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Sloan, Jeremy
30ae48dd-fe5d-402c-bb7b-ea7b0af29b99
Walton, Richard I.
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6 October 2014
Sardar, Kripasindhu
6e1c0d9e-7c4a-4d63-9ae5-78d8e368c457
Petrucco, Enrico
a4b154d1-20be-4df0-8912-8b32f7561ffc
Hiley, Craig I.
9d52a131-ee5a-4c19-85c5-b7fe90ae0405
Sharman, Jonathan D.B.
99568bba-42d3-40a1-9258-aabe348b8f2d
Wells, Peter P.
b63a96fc-8041-41c5-ad62-f2136d505696
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Kashtiban, Reza J.
2f6b0979-49ee-4e16-9c52-1ed7653c0485
Sloan, Jeremy
30ae48dd-fe5d-402c-bb7b-ea7b0af29b99
Walton, Richard I.
f6c3cb7e-643e-4f14-819f-84d521f4634f
Sardar, Kripasindhu, Petrucco, Enrico, Hiley, Craig I., Sharman, Jonathan D.B., Wells, Peter P., Russell, Andrea E., Kashtiban, Reza J., Sloan, Jeremy and Walton, Richard I.
(2014)
Water-splitting electrocatalysis in acid conditions using ruthenate-iridate pyrochlores.
Angewandte Chemie, 126 (41), .
(doi:10.1002/ange.201406668).
(PMID:25196322)
Abstract
The pyrochlore solid solution (Na0.33Ce0.67)(2)-(Ir1-xRux)(2)O-7 (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)O-2 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.
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e-pub ahead of print date: 1 September 2014
Published date: 6 October 2014
Organisations:
Electrochemistry
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Local EPrints ID: 395995
URI: http://eprints.soton.ac.uk/id/eprint/395995
ISSN: 0044-8249
PURE UUID: a5c5dc88-b469-4679-aa9e-9e43a07ba63c
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Date deposited: 02 Jun 2016 08:46
Last modified: 15 Mar 2024 02:58
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Contributors
Author:
Kripasindhu Sardar
Author:
Enrico Petrucco
Author:
Craig I. Hiley
Author:
Jonathan D.B. Sharman
Author:
Peter P. Wells
Author:
Reza J. Kashtiban
Author:
Jeremy Sloan
Author:
Richard I. Walton
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