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Tensile straining of iridium sites in manganese oxides for proton-exchange membrane water electrolysers

Author

Listed:
  • Hui Su

    (College of Chemistry and Chemical Engineering, Hunan Normal University)

  • Chenyu Yang

    (University of Science and Technology of China)

  • Meihuan Liu

    (Central South University)

  • Xu Zhang

    (Faculty of Materials and Manufacturing, Beijing University of Technology)

  • Wanlin Zhou

    (University of Science and Technology of China)

  • Yuhao Zhang

    (University of Science and Technology of China)

  • Kun Zheng

    (Faculty of Materials and Manufacturing, Beijing University of Technology)

  • Shixun Lian

    (College of Chemistry and Chemical Engineering, Hunan Normal University)

  • Qinghua Liu

    (University of Science and Technology of China)

Abstract

Although the acidic oxygen evolution reaction (OER) plays a crucial role in proton-exchange membrane water electrolysis (PEMWE) devices, challenges remain owing to the lack of efficient and acid-stable electrocatalysts. Herein, we present a low-iridium electrocatalyst in which tensile-strained iridium atoms are localized at manganese-oxide surface cation sites (TS-Ir/MnO2) for high and sustainable OER activity. In situ synchrotron characterizations reveal that the TS-Ir/MnO2 can trigger a continuous localized lattice oxygen-mediated (L-LOM) mechanism. In particular, the L-LOM process could substantially boost the adsorption and transformation of H2O molecules over the oxygen vacancies around the tensile-strained Ir sites and prevent further loss of lattice oxygen atoms in the inner MnO2 bulk to optimize the structural integrity of the catalyst. Importantly, the resultant PEMWE device fabricated using TS-Ir/MnO2 delivers a current density of 500 mA cm−2 and operates stably for 200 h.

Suggested Citation

  • Hui Su & Chenyu Yang & Meihuan Liu & Xu Zhang & Wanlin Zhou & Yuhao Zhang & Kun Zheng & Shixun Lian & Qinghua Liu, 2024. "Tensile straining of iridium sites in manganese oxides for proton-exchange membrane water electrolysers," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44483-6
    DOI: 10.1038/s41467-023-44483-6
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    References listed on IDEAS

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