Sulfonated aromatic polymers containing hexafluoroisopropylidene groups: A simple but effective structure for fuel cell membranes

Jinju Ahn, Ryo Shimizu, Kenji Miyatake*

*この研究の対応する著者

研究成果: Article査読

22 被引用数 (Scopus)

抄録

Partially fluorinated and sulfonated aromatic copolymers (SBAFs) were designed and synthesized as chemically stable, highly proton conductive membranes for fuel cell applications. The effect of hexafluoroisopropylidene groups on the membrane properties was investigated in detail by comparing with those of our previous sulfonated polyphenylene ionomer (SPP-QP) membranes. SBAFs were obtained by a Ni(0)-promoted coupling reaction with high molecular weight (Mw > 158 kDa and Mn > 42 kDa) to provide thin membranes with three different ion exchange capacities (IECs), 1.5, 2.5, and 3.0 mequiv. g-1. SBAF membranes showed higher water uptake and proton conductivity than those of SPP-QP membranes with comparable IEC values. The stress/strain curves and DMAs revealed that SBAF and SPP-QP membranes were similarly mechanically stable. The chemical stability evaluated by Fenton's test suggested that isopropylidene groups were intact under harsh oxidative conditions. In an H2/O2 fuel cell, SBAF membranes exhibited better performance (in particular, at low humidity) and durability than those of SPP-QP membranes. During an open circuit voltage (OCV) hold test, the SBAF fuel cell retained a high OCV value over 0.9 V with minor loss up to 1000 h (the average decay was -40 μV h-1).

本文言語English
ページ(範囲)24625-24632
ページ数8
ジャーナルJournal of Materials Chemistry A
6
47
DOI
出版ステータスPublished - 2018
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(全般)

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