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Water-splitting electrocatalysis in acid conditions using ruthenate-iridate pyrochlores
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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 International Edition, Volume 53 (Number 41). pp. 10960-10964. doi:10.1002/anie.201406668 ISSN 1433-7851.
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Official URL: http://dx.doi.org/10.1002/anie.201406668
Abstract
The pyrochlore solid solution (Na0.33Ce0.67)2(Ir1−xRux)2O7 (0≤x≤1), 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 in situ 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.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics |
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Journal or Publication Title: | Angewandte Chemie International Edition | ||||||||
Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | ||||||||
ISSN: | 1433-7851 | ||||||||
Official Date: | 6 October 2014 | ||||||||
Dates: |
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Volume: | Volume 53 | ||||||||
Number: | Number 41 | ||||||||
Page Range: | pp. 10960-10964 | ||||||||
DOI: | 10.1002/anie.201406668 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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