Water electrolysis on La1−xSrxCoO3−δ perovskite electrocatalysts
By J. T. Mefford, Ximing Rong, Artem M. Abakumov, William G. Hardin, S. Dai, A. Kolpak, Keith P. Johnston, K. Stevenson. Nature Communications, 2016
982 citations recorded by the source corpus.
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. Perovskite oxides are attractive candidates as catalysts for water electrolysis however their rational design is rare. Here, the authors report a series of cobaltite perovskites where the covalency of the Co-O bond and concentration of oxygen vacancies are controlled, and assess their catalytic performance.
Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/9716e122cc01d442ebd4e68e95d20dc3835bc77c
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Citations in the corpus
- Understanding the Mechanism of the Oxygen Evolution Reaction with Consideration of Spin (2020, background): “The underlying physics of the LOM involves the lowering of the Fermi level to the oxygen 2p band as induced by the strong overlap of metal 3d with oxygen 2p [33].”