Poly(arylene ether)s containing superacid groups as proton exchange membranes

Takefumi Mikami, Kenji Miyatake, Masahiro Watanabe

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

A series of poly(arylene ether)s containing pendant superacid groups on fluorenyl groups were synthesized and their properties were investigated for fuel cell applications. Poly(arylene ether)s containing iodo groups were synthesized by the polymerization of 2,7-diiodo-9,9-bis(4-hydroxyphenyl)fluorene with difluorinated compounds such as decafluorobiphenyl, bis(4-fluorophenyl) sulfone, and bis(4-fluorophenyl)ketone, under nucleophilic substitution conditions. The iodo groups on the fluorenyl groups were converted to perfluorosulfonic acid groups via the Ullmann coupling reaction. The degree of perfluorosulfonation was controlled to be up to 92%, which corresponds to an ion exchange capacity (IEC) of 1.52 meq/g. The ionomers yielded flexible, ductile membranes by solution casting. The ionomer membranes exhibited a characteristic hydrophilic/hydrophobic phase separation, with small interconnected hydrophilic clusters (2-3 nm), which is similar to that of the benchmark perfluorinated membrane (Nafion). The aromatic ionomers containing superacid groups showed much higher proton conductivities than those of the conventional sulfonated aromatic ionomers with similar main chain structures. Fuel cell performance with the superacidic ionomer membranes was also tested.

Original languageEnglish
Pages (from-to)1714-1721
Number of pages8
JournalACS Applied Materials and Interfaces
Volume2
Issue number6
DOIs
Publication statusPublished - 2010 Jun 23
Externally publishedYes

Keywords

  • fuel cells
  • ion conductive polymers
  • ionomers
  • poly(arylene ether)s
  • proton exchange membranes

ASJC Scopus subject areas

  • Materials Science(all)

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