Zirconium oxide modified sulfonated poly(ether either ketone) membranes for direct methanol fuel cell applications

V. Silva, B. Ruffmann, H. Silva, A. Mendes*, M. Madeira, S. Nunes

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

21 Scopus citations


In order to perform a critical analysis of the zirconium oxide effects in sulfonated poly(ether ether ketone) (SPEEK) membranes with two sulfonation degrees (SD), 71 and 87%, the characterization of composite membranes prepared with a systematic variation of the inorganic content is proposed. The method involves preparation of inorganic composite membranes with a wide range of properties which concern water swelling, chemical and thermal stability, methanol and water permeations and, finally, proton conductivity. A good balance between high proton conductivity, good chemical stability and low methanol permeability is reached for the SPEEK polymer with a 7.5% (w/w) ZrO2 content and SD=87%. Compared to NAFION®112, this membrane is 3-times more selective towards water/methanol permeation and has a similar proton conductivity (81 compared to 88 mS/cm).

Original languageEnglish (US)
Pages (from-to)587-591
Number of pages5
JournalMaterials Science Forum
StatePublished - 2004
Externally publishedYes
EventAdvanced Materials Forum II: Proceedings of the II International Materials Symposium: Materials 2003 and XI Encontro da Sociedade Portugesa de Materials, 2003 ATERIAIS - Caparica, Portugal
Duration: Apr 14 2003Apr 16 2003


  • Direct methanol fuel cell (DMFC)
  • Methanol crossover
  • Proton conductivity
  • Sulfonated poly(ether ether ketone) (SPEEK)
  • Zirconium oxide

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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