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; Keith J. Stevenson

doi:10.1038/ncomms11053

Water electrolysis on La_1-xSr_xCoO_3-δ perovskite electrocatalysts

J. Tyler Mefford, Xi Rong, Artem M. Abakumov, William G. Hardin, Sheng Dai, Alexie M. Kolpak, Keith P. Johnston, Keith J. Stevenson

Chemical Sciences Division

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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 La_1-xSr_xCoO_3-δ. We attempt to rationalize the high activities of La_1-xSr_xCoO_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_2.7, with a high, room temperature-specific activity and mass activity towards alkaline water electrolysis.

Original language	English
Article number	11053
Journal	Nature Communications
Volume	7
DOIs	https://doi.org/10.1038/ncomms11053
State	Published - Mar 23 2016

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title = "Water electrolysis on La1-xSrxCoO3-δ perovskite electrocatalysts",

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.",

author = "Mefford, {J. Tyler} and Xi Rong and Abakumov, {Artem M.} and Hardin, {William G.} and Sheng Dai and Kolpak, {Alexie M.} and Johnston, {Keith P.} and Stevenson, {Keith J.}",

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T1 - Water electrolysis on La1-xSrxCoO3-δ perovskite electrocatalysts

AU - Mefford, J. Tyler

AU - Rong, Xi

AU - Abakumov, Artem M.

AU - Hardin, William G.

AU - Dai, Sheng

AU - Kolpak, Alexie M.

AU - Johnston, Keith P.

AU - Stevenson, Keith J.

PY - 2016/3/23

Y1 - 2016/3/23

N2 - 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.

AB - 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.

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Water electrolysis on La_1-xSr_xCoO_3-δ perovskite electrocatalysts

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