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Polybenzimidazole-crosslinked-poly(vinyl benzyl chloride) as anion exchange membrane for alkaline electrolyzers

Author

Listed:
  • Coppola, R.E.
  • Herranz, D.
  • Escudero-Cid, R.
  • Ming, N.
  • D’Accorso, N.B.
  • Ocón, P.
  • Abuin, G.C.

Abstract

Zero-gap liquid alkaline water electrolyzers have great potential for hydrogen production. In order to enhance their actual performance, one of the key components to investigate is the anionic exchange membrane that allows the conduction of anions between the electrodes. This paper reports the preparation and characterization of membranes composed of a polybenzimidazole, either poly(2,5-benzimidazole) (ABPBI) or poly[2-2′-(m-phenylene)-5-5′-bibenzimidazole] (PBI), crosslinked with different ratios of poly(vinylbenzyl chloride) (PVBC), forming thermally stable and homogeneous films. Quaternization of these films with 1,4-diazabicyclo (2.2.2) octane (DABCO) followed by immersion in an alkaline solution lead to the introduction of quaternary ammonium groups and hydroxide anions respectively. Adequate thermal stability is observed in the temperature range of application (below 100 °C). Measurements of KOH and water and related swelling reflect the higher absorption capacity of ABPBI based membranes relative to PBI based ones. ABPBI-c-PVBC/OH 1:2 membranes at 50 °C are characterized by high ionic conductivity values (48 mS cm−1), reaching 380 mA cm−2 at cell voltage 1.98 V. In conclusion, we consider that these membranes are competitive candidates as anion exchange membranes for zero-gap alkaline water electrolyzers, and can be further enhanced to reach the performance of state of the art AEM’s.

Suggested Citation

  • Coppola, R.E. & Herranz, D. & Escudero-Cid, R. & Ming, N. & D’Accorso, N.B. & Ocón, P. & Abuin, G.C., 2020. "Polybenzimidazole-crosslinked-poly(vinyl benzyl chloride) as anion exchange membrane for alkaline electrolyzers," Renewable Energy, Elsevier, vol. 157(C), pages 71-82.
    • Handle: RePEc:eee:renene:v:157:y:2020:i:c:p:71-82
    DOI: 10.1016/j.renene.2020.04.140
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    References listed on IDEAS

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    1. Herranz, D. & Escudero-Cid, R. & Montiel, M. & Palacio, C. & Fatás, E. & Ocón, P., 2018. "Poly (vinyl alcohol) and poly (benzimidazole) blend membranes for high performance alkaline direct ethanol fuel cells," Renewable Energy, Elsevier, vol. 127(C), pages 883-895.
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    Cited by:

    1. Xu, Shicheng & Wu, Wanlong & Wan, Ruiying & Wei, Wei & Li, Yujiao & Wang, Jin & Sun, Xiaoqi & He, Ronghuan, 2022. "Tailoring the molecular structure of pyridine-based polymers for enhancing performance of anion exchange electrolyte membranes," Renewable Energy, Elsevier, vol. 194(C), pages 366-377.

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