Reduction of methanol permeability in polyetherketone-heteropolyacid membranes

M. L. Ponce, L. Prado, B. Ruffmann, K. Richau, R. Mohr, Suzana Nunes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

Organic-inorganic membranes for direct methanol fuel cell (DMFC) application were prepared, using an organic matrix of sulfonated polyetherketone (s-PEK), different heteropolyacids and an inorganic network of ZrO2 or RSiO3/2. The membranes were characterized concerning their methanol and water permeability by pervaporation and ionic conductivity by impedance spectrometry. The bleeding out of the heteropolyacid from the membrane was quantified. The presence of the ZrO2 decreases the methanol and water permeability and reduces the bleeding out of the heteropolyacid. Molybdophosphoric acid (MoPA) was also investigated, showing a more pronounced bleeding out effect, which could be reduced by modifying the anion structure with the inclusion of Ni or Si. High conductivity values were obtained with membranes containing tungstophosphoric acid (TPA).

Original languageEnglish (US)
Pages (from-to)5-15
Number of pages11
JournalJournal of Membrane Science
Volume217
Issue number1-2
DOIs
StatePublished - Jun 1 2003

Keywords

  • Direct methanol fuel cell
  • Heteropolyacids
  • Organic-inorganic membranes

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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