Development of function-graded proton exchange membrane for PEFC using heavy ion beam irradiation

Fumiya Shiraki, Taeko Yoshikawa, Akihiro Oshima*, Yuji Oshima, Yuya Takasawa, Naoyuki Fukutake, Tomoko Gowa Oyama, Tatsuya Urakawa, Hajime Fujita, Tomohiro Takahashi, Toshitaka Oka, Hisaaki Kudo, Takeshi Murakami, Yoshimasa Hama, Masakazu Washio

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The graded energy deposition of heavy ion beam irradiation to polymeric materials was utilized to synthesize a novel proton exchange membrane (PEM) with the graded density of sulfonic acid groups toward the thickness direction. Stacked Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) films were irradiated by Xe54+ ion beam with the energy of 6 MeV/u under a vacuum condition. The induced trapped radicals by the irradiation were measured by electron spin resonance (ESR) spectroscopy. Irradiated films were grafted with styrene monomer and then sulfonated. X-ray photo-electron spectroscopy (XPS) spectra showed that the densities of sulfonic acid groups were controlled for injection "Surface" and transmit "Back" sides of the fabricated PEM. The membrane electrode assembly (MEA) fabricated by the function-graded PEM showed improved fuel cell performance in terms of voltage stability. It was expected that the function-graded PEM could control the graded concentration of sulfonic acid groups in PEM.

Original languageEnglish
Pages (from-to)1777-1781
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number15
Publication statusPublished - 2011 Aug 1


  • Function-gradient
  • Heavy ion beam
  • PEFC
  • Proton exchange membrane
  • Radiation-induced grafting

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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