Robust anion conductive polymers containing perfluoroalkylene and pendant ammonium groups for high performance fuel cells

Hideaki Ono, Taro Kimura, Aoi Takano, Koichiro Asazawa, Junpei Miyake, Junji Inukai, Kenji Miyatake

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

A novel series of ammonium-containing copolymers (QPAF-4) were designed and synthesized as anion exchange membranes for alkaline fuel cell applications. The copolymers were prepared via a nickel promoted polycondensation reaction with high molecular weights (Mw = 72.7-276.4 kDa as precursors) and were composed of perfluoroalkylene and fluorenyl groups with pendant ammonium groups. The QPAF-4 membrane with optimized copolymer composition and ion exchange capacity exhibited high hydroxide ion conductivity (86.2 mS cm-1 in water at 80 °C) and excellent mechanical properties (large elongation at break = 269%). A severe alkaline stability test of the QPAF-4 membranes in 1 M KOH at 80 °C for 1000 h and the post-test analyses of the 1H NMR spectra, solubility, and mechanical properties revealed minor, or no, changes in the chemical structure and properties. Alkaline fuel cells using the QPAF-4 membrane were operated using hydrazine as a fuel and oxygen or air as oxidant to achieve the high maximum power density of 515 mW cm-2. The durability of the membrane was also confirmed in the operating fuel cell at a constant current density for longer than 1000 h.

Original languageEnglish
Pages (from-to)24804-24812
Number of pages9
JournalJournal of Materials Chemistry A
Volume5
Issue number47
DOIs
Publication statusPublished - 2017
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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