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Promoting in-situ stability of hydroxide exchange membranes by thermally conductive network for durable water electrolysis

Author

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  • Wei Wang

    (Tianjin University
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Ruixiang Guo

    (Tianjin University
    Haihe Laboratory of Sustainable Chemical Transformations
    Tianjin University)

  • Aodi Zheng

    (Tianjin University)

  • Xiaorui Jin

    (Tianjin University
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Xiongjie Jia

    (Tianjin University)

  • Zhiwei Ren

    (Chinese Academy of Sciences)

  • Yangkai Han

    (Chinese Academy of Sciences)

  • Lifeng Zhang

    (Tianjin University)

  • Yeming Zhai

    (Tianjin University
    Haihe Laboratory of Sustainable Chemical Transformations
    Tianjin University)

  • Xiaofen Liu

    (Tianjin University
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Haoran Jiang

    (Tianjin University)

  • Yun Zhao

    (Chinese Academy of Sciences)

  • Kai-Ge Zhou

    (Tianjin University
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Meiling Wu

    (Tianjin University
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Zhongyi Jiang

    (Haihe Laboratory of Sustainable Chemical Transformations
    Tianjin University
    Binhai New City)

Abstract

Hydroxide exchange membrane (HEM) water electrolysis is promising for green hydrogen production due to its low cost and excellent performance. However, HEM often has insufficient stability in strong alkaline solutions, particularly under in-situ electrolysis operation conditions, hindering its commercialization. In this study, we discover that the in-situ stability of HEM is primarily impaired by the locally accumulated heat in HEM due to its low thermal conductivity. Accordingly, we propose highly thermally conductive HEMs with an efficient three-dimensional (3D) thermal diffusion network to promote the in-situ stability of HEM for water electrolysis. Based on the 3D heat conductive network, the thermal conductivity of polymeric HEM is boosted by 32 times and thereby reduce the HEM temperature by up to 4.9 °C in a water electrolyzer at the current density of 1 A cm−2. Thus, the thermally conductive HEM exhibits negligible degradation after 20,000 start/stop cycles and reduces the degradation rate by 6 times compared to the pure polymeric HEM in a water electrolyzer. This study manifests the significance of thermal conductivity of HEM on the durability of water electrolysis, which provides guidelines on the rational design of highly durable HEMs in practical operation conditions for water electrolysis, fuel cells, and beyond.

Suggested Citation

  • Wei Wang & Ruixiang Guo & Aodi Zheng & Xiaorui Jin & Xiongjie Jia & Zhiwei Ren & Yangkai Han & Lifeng Zhang & Yeming Zhai & Xiaofen Liu & Haoran Jiang & Yun Zhao & Kai-Ge Zhou & Meiling Wu & Zhongyi J, 2025. "Promoting in-situ stability of hydroxide exchange membranes by thermally conductive network for durable water electrolysis," Nature Communications, Nature, vol. 16(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-56262-6
    DOI: 10.1038/s41467-025-56262-6
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