An impedance study on the sPEEK/ZrO 2 membranes for direct methanol fuel cell applications

V. B. Silva, V. S. Silva, L. M. Madeira, Suzana Nunes, A. Mendes

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

Electrochemical impedance experiments were carried out in order to study the influence of the ZrO 2 inorganic incorporation on the proton conductivity of sulfonated poly(ether ether ketone) (sPEEK) membranes. The impedance data was fitted to an extension of Randles' circuit, within the inorganic content and temperature ranges considered. The model fits quite well for ZrO 2 loads up to 10 wt.%. Such a model allows for characterizing the diffusion phenomena (Warburg) of the membrane electrode assembly (MEA), membrane and electrodes resistances, capacitive and inductive behavior. Proton conductivity was obtained from the impedance spectra and it was observed that it increases with temperature and decreases with the inorganic content. As a general trend, the Warburg parameter decreases slightly with the temperature, except for the 5 wt. % ZrO 2 membrane that suffers a more pronounced influence, The Warburg parameter also decreases with the ZrO 2 content.

Original languageEnglish (US)
Pages (from-to)926-930
Number of pages5
JournalMaterials Science Forum
Volume587-588
StatePublished - Dec 1 2008
EventAdvanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM - Porto, Portugal
Duration: Apr 1 2007Apr 4 2007

Keywords

  • Analogue circuit
  • Electrochemical impedance spectroscopy (EIS)
  • Proton conductivity
  • sPEEK/ZrO membranes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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