Water and methanol uptake in proton conducting Nafion® membranes

Eivind Skou*, P. Kauranen, J. Hentschel

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

73 Citations (Scopus)

Abstract

Methanol uptake from methanol-water mixtures has been measured at ambient temperature in Nafion®117 membranes initially saturated with water. After equilibration for 18 h the membranes were dried at 70°C in vacuum with a cold trap cooled with liquid nitrogen and the total amount of absorbent was determined from the weight loss. The methanol-water ratio was determined by 1H NMR. A plot of the mole fraction of methanol in the membrane vs. the mole fraction in the water-methanol mixture was linear in the whole range from pure water to pure methanol. The slope indicated that Nafion® does not preferentially take up either water or methanol. The number of solvent molecules was found to be 23 per sulphonic group for both methanol and water.

Original languageEnglish
Pages (from-to)333-337
Number of pages5
JournalSolid State Ionics
Volume97
Issue number1-4
Publication statusPublished - 1 May 1997
MoE publication typeA1 Journal article-refereed

Keywords

  • Methanol
  • Nafion
  • Polymer electrolyte
  • Proton conductor

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