Highly Anion Conductive Polymers: How Do Hexafluoroisopropylidene Groups Affect Membrane Properties and Alkaline Fuel Cell Performance?

Taro Kimura, Akinobu Matsumoto, Junji Inukai*, Kenji Miyatake

*この研究の対応する著者

研究成果: Article査読

19 被引用数 (Scopus)

抄録

Novel anion conductive aromatic copolymers containing hexafluoroisopropylidene groups as the hydrophobic component and fluorenyl groups substituted with pendant hexyltrimethylammonium groups as the hydrophilic component were synthesized and characterized. Precursor copolymers, BAF-AF, were synthesized by a nickel(0) promoted polycondensation reaction and had a high molecular weight (Mn = 10-12 kDa, Mw = 77-115 kDa). Quaternization of BAF-AF using dimethyl sulfate gave tough and bendable thin BAF-QAF membranes having the ion exchange capacity (IEC) from 1.3 to 2.4 mequiv g-1 by solution casting. The morphology of BAF-QAFs was investigated by TEM images and SAXS profiles, and a nanoscale fine phase-separated structure was confirmed. The BAF-QAF membrane with IEC of 2.4 mequiv g-1 showed a superior OH- conductivity (134 mS cm-1 at 80 °C) in water. The membranes retained high conductivity under strongly alkaline conditions (∼4 M KOH at 80 °C) for 1000 h. An H2/O2 anion alkaline fuel cell using the BAF-QAF membrane and binder achieved the maximum power density of 319 mW cm-2 at 702 mA cm-2 at 60 °C and 100% RH. Hexafluoroisopropylidene groups contributed to improving membrane properties as anion exchange membranes for alkaline fuel cells.

本文言語English
ページ(範囲)469-477
ページ数9
ジャーナルACS Applied Energy Materials
3
1
DOI
出版ステータスPublished - 2020 1月 27
外部発表はい

ASJC Scopus subject areas

  • 化学工学(その他)
  • エネルギー工学および電力技術
  • 電気化学
  • 材料化学
  • 電子工学および電気工学

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