Sulfonated poly(arylene ether sulfone ketone) multiblock copolymers with highly sulfonated blocks. Long-term fuel cell operation and post-test analyses

Byungchan Bae, Kenji Miyatake, Makoto Uchida, Hiroyuki Uchida, Yoko Sakiyama, Takeou Okanishi, Masahiro Watanabe

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The stability of poly(arylene ether sulfone ketone) (SPESK) multiblock copolymer membranes having highly sulfonated hydrophilic blocks was tested in an operating fuel cell. The electrochemical properties and drain water were monitored during the test, followed by post-test analyses of the membrane. During a 2000-h fuel cell operation test at 80 °C and 53% RH (relative humidity) and with a constant current density (0.2 A cm-2), the cell voltage showed minor losses, with slight increases in the resistance. In the drain water, anions such as formate, acetate, and sulfate were observed. Post-test analyses of the chemical structure by NMR and IR spectra revealed that the sulfonated fluorenyl group with ether linkage was the most likely to have degraded during the long-term operation, producing these small molecules. The minor oxidative degradation only slightly affected the proton conductivity, water uptake, and phase-separated morphology.

Original languageEnglish
Pages (from-to)2786-2793
Number of pages8
JournalACS Applied Materials and Interfaces
Volume3
Issue number7
DOIs
Publication statusPublished - 2011 Jul 27
Externally publishedYes

Keywords

  • block copolymer membranes
  • durability
  • fuel cells
  • ionomers
  • poly(arylene ether sulfone ketone)s

ASJC Scopus subject areas

  • Materials Science(all)

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