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An operationally broadened alkaline water electrolyser enabled by highly stable poly(oxindole biphenylene) ion-solvating membranes

Author

Listed:
  • Xu Hu

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences)

  • Bin Hu

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences)

  • Chengyuan Niu

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences)

  • Jin Yao

    (Ningbo Sino-Tech Hydrogen Membrane Technology Co., Ltd)

  • Min Liu

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences)

  • Huabing Tao

    (State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and College of Chemistry and Chemical Engineering, Xiamen University)

  • Yingda Huang

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences)

  • Shuanyan Kang

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences)

  • Kang Geng

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences)

  • Nanwen Li

    (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences)

Abstract

Ion-solvating membranes (ISMs) are an alternative to proton-exchange and anion-exchange membranes for use in water electrolysers. ISMs do not have fixed ionic groups in their structure but instead gain their ionic conductivity through the uptake of liquid electrolyte. Although in principle they could offer improved stability over anion-exchange membranes due to the absence of easily degradable anion-exchange groups, stability gains have been modest. Here we report poly(oxindole biphenylene)-based ISMs with highly stable oxindole/KOH complex ion pairs for use in water electrolysers. These ISMs exhibit promising alkaline stability at 80 °C with a negligible conductivity decay over more than 15,000 h and, thus, allow durable alkaline electrolysis over 2,500 h, even at elevated temperatures and high operating voltages of 2.3 V. Moreover, they show ultralow gas permeation and, thus, low transient response times (

Suggested Citation

  • Xu Hu & Bin Hu & Chengyuan Niu & Jin Yao & Min Liu & Huabing Tao & Yingda Huang & Shuanyan Kang & Kang Geng & Nanwen Li, 2024. "An operationally broadened alkaline water electrolyser enabled by highly stable poly(oxindole biphenylene) ion-solvating membranes," Nature Energy, Nature, vol. 9(4), pages 401-410, April.
    • Handle: RePEc:nat:natene:v:9:y:2024:i:4:d:10.1038_s41560-023-01447-w
    DOI: 10.1038/s41560-023-01447-w
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