Iridium-based double perovskites for efficient water oxidation in acid media

Oscar Diaz-Morales, Stefan Raaijman, Ruud Kortlever, Patricia J. Kooyman, Tim Wezendonk, Jorge Gascon, W. T. Fu and Marc T. M. Koper ()
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Oscar Diaz-Morales: Leiden Institute of Chemistry, Leiden University
Stefan Raaijman: Leiden Institute of Chemistry, Leiden University
Ruud Kortlever: Leiden Institute of Chemistry, Leiden University
Patricia J. Kooyman: ChemE, Faculty of Applied Sciences, Delft University of Technology
Tim Wezendonk: ChemE, Faculty of Applied Sciences, Delft University of Technology
Jorge Gascon: ChemE, Faculty of Applied Sciences, Delft University of Technology
W. T. Fu: Leiden Institute of Chemistry, Leiden University
Marc T. M. Koper: Leiden Institute of Chemistry, Leiden University

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract The development of active, cost-effective and stable oxygen-evolving catalysts is one of the major challenges for solar-to-fuel conversion towards sustainable energy generation. Iridium oxide exhibits the best available compromise between catalytic activity and stability in acid media, but it is prohibitively expensive for large-scale applications. Therefore, preparing oxygen-evolving catalysts with lower amounts of the scarce but active and stable iridium is an attractive avenue to overcome this economical constraint. Here we report on a class of oxygen-evolving catalysts based on iridium double perovskites which contain 32 wt% less iridium than IrO2 and yet exhibit a more than threefold higher activity in acid media. According to recently suggested benchmarking criteria, the iridium double perovskites are the most active catalysts for oxygen evolution in acid media reported until now, to the best of our knowledge, and exhibit similar stability to IrO2.

Date: 2016
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DOI: 10.1038/ncomms12363

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