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Double cross-linked 3D layered PBI proton exchange membranes for stable fuel cell performance above 200 °C

Author

Listed:
  • Liang Zhang

    (Zhejiang University of Technology)

  • Mengjiao Liu

    (Zhejiang University of Technology)

  • Danyi Zhu

    (Zhejiang University of Technology)

  • Mingyuan Tang

    (Zhejiang University of Technology)

  • Taizhong Zhu

    (Zhejiang University of Technology)

  • Congjie Gao

    (Zhejiang University of Technology)

  • Fei Huang

    (Zhejiang University of Technology)

  • Lixin Xue

    (Wenzhou University
    Wenzhou University)

Abstract

Phosphoric acid doped proton exchange membranes often experience performance degradation above 200 °C due to membrane creeping and phosphoric acid evaporation, migration, dehydration, and condensation. To address these issues, here we present gel-state polybenzimidazole membranes with double cross-linked three-dimensional layered structures via a polyphosphoric acid sol-gel process, enabling stable operation above 200 °C. These membranes, featuring proton-conducting cross-linking phosphate bridges and branched polybenzimidazole networks, effectively anchor and retain phosphoric acid molecules, prevent 96% of its dehydration and condensation, improve creep resistance, and maintain excellent proton conductivity stability. The resulting membrane, with superior through-plane proton conductivity of 0.348 S cm−1, delivers outstanding peak power densities ranging from 1.20–1.48 W cm−2 in fuel cells operated at 200-240 °C and a low voltage decay rate of only 0.27 mV h−1 over a 250-hour period at 220 °C, opening up possibilities for their direct integration with methanol steam reforming systems.

Suggested Citation

  • Liang Zhang & Mengjiao Liu & Danyi Zhu & Mingyuan Tang & Taizhong Zhu & Congjie Gao & Fei Huang & Lixin Xue, 2024. "Double cross-linked 3D layered PBI proton exchange membranes for stable fuel cell performance above 200 °C," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47627-4
    DOI: 10.1038/s41467-024-47627-4
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    References listed on IDEAS

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    1. Hongying Tang & Kang Geng & Lei Wu & Junjie Liu & Zhiquan Chen & Wei You & Feng Yan & Michael D. Guiver & Nanwen Li, 2022. "Fuel cells with an operational range of –20 °C to 200 °C enabled by phosphoric acid-doped intrinsically ultramicroporous membranes," Nature Energy, Nature, vol. 7(2), pages 153-162, February.
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