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Water electrolysis on La1−xSrxCoO3−δ perovskite electrocatalysts

Author

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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
    Electron Microscopy for Material Science, University of Antwerp, Groenenborgerlaan 171)

  • 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
    The University of Texas at Austin)

  • Keith J. Stevenson

    (The University of Texas at Austin
    Center for Electrochemical Energy Storage, Skolkovo Institute of Science and Technology
    Texas Materials Institute, The University of Texas at Austin
    Center for Nano and Molecular Science and Technology, The University of Texas at Austin)

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.

Suggested Citation

  • J. Tyler Mefford & Xi Rong & Artem M. Abakumov & William G. Hardin & Sheng Dai & Alexie M. Kolpak & Keith P. Johnston & Keith J. Stevenson, 2016. "Water electrolysis on La1−xSrxCoO3−δ perovskite electrocatalysts," Nature Communications, Nature, vol. 7(1), pages 1-11, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11053
    DOI: 10.1038/ncomms11053
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    Cited by:

    1. Zuyun He & Jun Zhang & Zhiheng Gong & Hang Lei & Deng Zhou & Nian Zhang & Wenjie Mai & Shijun Zhao & Yan Chen, 2022. "Activating lattice oxygen in NiFe-based (oxy)hydroxide for water electrolysis," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    2. Zuyun He & Jinwoo Hwang & Zhiheng Gong & Mengzhen Zhou & Nian Zhang & Xiongwu Kang & Jeong Woo Han & Yan Chen, 2022. "Promoting biomass electrooxidation via modulating proton and oxygen anion deintercalation in hydroxide," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Pengcheng Ye & Keqing Fang & Haiyan Wang & Yahao Wang & Hao Huang & Chenbin Mo & Jiqiang Ning & Yong Hu, 2024. "Lattice oxygen activation and local electric field enhancement by co-doping Fe and F in CoO nanoneedle arrays for industrial electrocatalytic water oxidation," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    4. Jia-Wei Zhao & Kaihang Yue & Hong Zhang & Shu-Yin Wei & Jiawei Zhu & Dongdong Wang & Junze Chen & Vyacheslav Yu. Fominski & Gao-Ren Li, 2024. "The formation of unsaturated IrOx in SrIrO3 by cobalt-doping for acidic oxygen evolution reaction," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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