Investigation of proton diffusion in Nafion®117 membrane by electrical conductivity and NMR

Shimon Ochi, Osamu Kamishima, Junichiro Mizusaki, Junichi Kawamura

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)


The proton dynamics in Nafion ®117 is investigated by comparison of the diffusion coefficient DNMR estimated from PFG-NMR with that of Dσ estimated from electrical conductivity. At high water content region, Dσ is about two times higher than DNMR as a result of Grotthuss mechanism. At low water content region, Dσ and DNMR are in good agreement with each other. Both of the diffusion coefficients decrease steeply at low water content region. It can be explained as a result of the percolation transition due to the isolation of ion clusters, which is suggested by the recent small angle X-ray scattering data.

Original languageEnglish
Pages (from-to)580-584
Number of pages5
JournalSolid State Ionics
Issue number6-8
Publication statusPublished - 2009 May 14


  • Diffusion coefficient
  • NMR
  • Nafion
  • Percolation transition
  • Proton conductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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