Synthesis and characterization of anion-exchange multi-block-copolymer membranes containing highly densified cationic functional groups

Adam F. Nugraha, Mutya Rahmah Arbi, Farid Wijaya, Hyejin Lee, Dongwon Shin, Byungchan Bae

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Alkaline polymer electrolytes based on an aromatic quaternized poly (arylene ether) (QPE) multi-block copolymer with highly densified cationic functional groups were prepared for alkaline membrane fuel cell (AMFC) applications. Three different cationic groups, namely trimethylammonium (QPE-TMA), piperidinium (QPE-Pip), and quinuclidinium (QPE-Qui), were introduced to evaluate the effect of cations on membrane electrochemical properties. The hydroxide-ion conductivity of QPE-TMA (53.3 mS cm−1 in water at 25 °C) was much higher than that of a commercial Fumatech membrane, although the corresponding ion-exchange capacity values were similar. Moreover, the relative humidity–dependent anion conductivity and water uptake capacity of QPE-TMA membranes exceeded those of the commercial membrane. Long-term chemical stability was probed by monitoring anion conductivity upon the immersion of membranes in 1 M NaOH and was highest for QPE-TMA. Moreover, at 70 °C, the AMFC single-cell performance of QPE-TMA (331 mW cm−2) was superior to that of the Fumatech membrane (208 mW cm−2).

Original languageEnglish
Article number122996
JournalPolymer
Volume210
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Anion conductivity
  • Anion-exchange membranes
  • Cationic group
  • Multi-block-copolymer
  • Quaternization

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