Water electrolysis on La1−xSrxCoO3−δ perovskite electrocatalysts

J. Tyler Mefford, Xi Rong, Artem M. Abakumov, William G. Hardin, Sheng Dai, Alexie M. Kolpak, Keith P. Johnston and Keith J. Stevenson ()
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J. Tyler Mefford: The University of Texas at Austin
Xi Rong: Massachusetts Institute of Technology
Artem M. Abakumov: Center for Electrochemical Energy Storage, Skolkovo Institute of Science and Technology
William G. Hardin: Texas Materials Institute, The University of Texas at Austin
Sheng Dai: Oak Ridge National Laboratory
Alexie M. Kolpak: Massachusetts Institute of Technology
Keith P. Johnston: Texas Materials Institute, The University of Texas at Austin
Keith J. Stevenson: The University of Texas at Austin

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Perovskite oxides are attractive candidates as catalysts for the electrolysis of water in alkaline energy storage and conversion systems. However, the rational design of active catalysts has been hampered by the lack of understanding of the mechanism of water electrolysis on perovskite surfaces. Key parameters that have been overlooked include the role of oxygen vacancies, B–O bond covalency, and redox activity of lattice oxygen species. Here we present a series of cobaltite perovskites where the covalency of the Co–O bond and the concentration of oxygen vacancies are controlled through Sr2+ substitution into La1−xSrxCoO3−δ. We attempt to rationalize the high activities of La1−xSrxCoO3−δ through the electronic structure and participation of lattice oxygen in the mechanism of water electrolysis as revealed through ab initio modelling. Using this approach, we report a material, SrCoO2.7, with a high, room temperature-specific activity and mass activity towards alkaline water electrolysis.

Date: 2016
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DOI: 10.1038/ncomms11053

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