Anion conductive aromatic block copolymers containing diphenyl ether or sulfide groups for application to alkaline fuel cells

Naoki Yokota, Hideaki Ono, Junpei Miyake, Eriko Nishino, Koichiro Asazawa, Masahiro Watanabe, Kenji Miyatake

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A novel series of aromatic block copolymers composed of fluorinated phenylene and biphenylene groups and diphenyl ether (QPE-bl-5) or diphenyl sulfide (QPE-bl-6) groups as a scaffold for quaternized ammonium groups is reported. The block copolymers were synthesized via aromatic nucleophilic substitution polycondensation, chloromethylation, quaternization, and ion exchange reactions. The block copolymers were soluble in organic solvents and provided thin and bendable membranes by solution casting. The membranes exhibited well-developed phase-separated morphology based on the hydrophilic/hydrophobic block copolymer structure. The membranes exhibited mechanical stability as confirmed by DMA (dynamic mechanical analyses) and low gas and hydrazine permeability. The QPE-bl-5 membrane with the highest ion exchange capacity (IEC = 2.1 mequiv g-1) exhibited high hydroxide ion conductivity (62 mS cm-1) in water at 80 °C. A noble metal-free fuel cell was fabricated with the QPE-bl-5 as the membrane and electrode binder. The fuel cell operated with hydrazine as a fuel exhibited a maximum power density of 176 mW cm-2 at a current density of 451 mA cm-2.

Original languageEnglish
Pages (from-to)17044-17052
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number19
DOIs
Publication statusPublished - 2014 Oct 8
Externally publishedYes

Keywords

  • alkaline fuel cells
  • anion conductive membranes
  • block copolymers
  • hydrazine
  • poly(arylene ether)

ASJC Scopus subject areas

  • Materials Science(all)

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