Study on the alkaline stability of imidazolium and benzimidazolium based polyelectrolytes for anion exchange membrane fuel cells

Li Cheng Jheng, Chin Kuen Tai, Steve Lien Chung Hsu, Bi Yun Lin, Likey Chen, Bo Cheng Wang, Lieh Kuang Chiang, Wen Ching Ko

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Imidazolium and benzimidazolium groups containing anion exchange membranes (AEMs) were synthesized by the functionalization of poly(styrene-co-vinylbenzyl chloride) with methylimidazole and methylbenzylimidazole, respectively. The essential properties for AEMs used in anion exchange membrane fuel cells (AEMFCs) including ion exchange capacity, water uptake, hydration number, and ionic conductivity were investigated. A comparative study of these two AEMs focusing on the alkaline stability was conducted in the present work. We have used TGA, FTIR, 1H NMR, and 13C NMR techniques to evaluate the susceptibility to alkaline degradation. Meanwhile, we have performed density functional theory (DFT) calculations to confirm the experimental results of the alkaline degradation study. It has been found that the benzimidazolium cations would be more easily attacked by OH anions leading to ring-opening compared to the imidazolium cations.

Original languageEnglish
Pages (from-to)5315-5326
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number8
DOIs
Publication statusPublished - 2017 Feb 23

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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