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Polymeric ionic liquids and piperidinium synergistically improve proton conductivity and acid retention of polybenzimidazole-based proton exchange membranes

Author

Listed:
  • Guan, Xianfeng
  • Yu, Di
  • Luo, Yu
  • Zhang, Shuyu
  • Wu, Wanzhen
  • Feng, Xu
  • Gao, Tongtong
  • Bai, Wenyu
  • Wang, Shuang

Abstract

Amino-type polybenzimidazole is prepared, then ionic liquid with three nitrogen positive sites ([CTDTr]Br3) is polymerized into polymeric ionic liquids (PILs) by in-situ radical polymerization, and AmPBI-CTDTr-Px membranes were prepared by piperidinium (PPd) and [CTDTr]Br3 combination to cross-linked with AmPBI. Following treatment with KOH and phosphoric acid (PA), the ion pairs (N+ - H2PO4−) generated in the composite membrane system can enhance proton conductivity and facilitate proton transport. The AmPBI-CTDTr-Px membranes shown exceptional PA retention as a result of the alkaline properties of both [CTDTr]Br3 and PPd, which can engage in acid-base interactions with phosphoric acid. Specifically, the proton conductivity of AmPBI-CTDTr-P5 at 180 °C is 129.7 mS cm−1, which is 2.52 times that of pure membranes. Acid retention of AmPBI-CTDTr-P5 at 80 °C/40 % RH and 160 °C are 64.4 % and 84 %.

Suggested Citation

  • Guan, Xianfeng & Yu, Di & Luo, Yu & Zhang, Shuyu & Wu, Wanzhen & Feng, Xu & Gao, Tongtong & Bai, Wenyu & Wang, Shuang, 2024. "Polymeric ionic liquids and piperidinium synergistically improve proton conductivity and acid retention of polybenzimidazole-based proton exchange membranes," Renewable Energy, Elsevier, vol. 237(PD).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pd:s0960148124019402
    DOI: 10.1016/j.renene.2024.121872
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