Electrochemical impedance studies of hybrids of perfluorosulfonic acid ionomer and silicon oxide by sol-gel reaction from solution

R. A. Zoppi*, Suzana Nunes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

Hybrids of Nafion® and silica were prepared from solution, growing the inorganic phase by hydrolysis/condensation of alkoxy silanes. Using tetraethoxysilane (TEOS) as the inorganic precursor, transparent and rigid films were obtained. Substituting part of the TEOS (20 wt% substitution) by 1,1,3,3 tetramethyl-1,3-diethoxydisiloxane (TMDES) more flexible films were obtained. These films were translucent and showed a phase segregation which was clearly observed by transmission electron microscopy. The ionic conductivity of the hybrids was measured by electrochemical impedance spectroscopy using two stainless steel electrodes, a frequency range of 0.1 to 105 Hz, and temperatures from 25 to 100°C. Samples were also characterized by modulated differential scanning calorimetry.

Original languageEnglish (US)
Pages (from-to)39-45
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume445
Issue number1-2
DOIs
StatePublished - Mar 31 1998

Keywords

  • Composites
  • Hybrid materials
  • Ionic conductivity
  • Nafion®

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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