Water electrolysis on La[scubscript 1−x]Sr[scubscript x]CoO[scubscript 3−δ] perovskite electrocatalysts
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Mefford-2016-Water electrolysis.pdf
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Author(s)
Mefford, J. Tyler
Rong, Xi
Abakumov, Artem M.
Hardin, William G.
Dai, Sheng
Kolpak, Alexie M.
Johnston, Keith P.
Stevenson, Keith J.
Alternative Title
Water electrolysis on La1−xSrxCoO3−δ perovskite electrocatalysts
Date Issued
March 2016
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Mefford, J. Tyler, Xi Rong, Artem M. Abakumov, William G. Hardin, Sheng Dai, Alexie M. Kolpak, Keith P. Johnston, and Keith J. Stevenson. “Water Electrolysis on La1−xSrxCoO3−δ Perovskite Electrocatalysts.” Nat Comms 7 (March 23, 2016): 11053. © 2017 Macmillan Publishers Limited
Version
Final published version
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 Sr[superscript 2+] substitution into La[scubscript 1−x]Sr[scubscript x]CoO[scubscript 3−δ]. We attempt to rationalize the high activities of La[scubscript 1−x]Sr[scubscript x]CoO[scubscript 3−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, SrCoO[subscript 2.7], with a high, room temperature-specific activity and mass activity towards alkaline water electrolysis.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1038/ncomms11053
