Proton conducting membranes based on benzimidazole sulfonic acid doped sulfonated poly(oxadiazole-triazole) copolymer for low humidity operation

M. L. Ponce, M. Boaventura, D. Gomes, A. Mendes, L. M. Madeira, Suzana Nunes

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

This work reports for the first time the preparation of sulphonated poly(oxadiazole-triazole) copolymer membranes doped with amphoteric molecule, 1H-benzimidazole-2-sulphonic acid and their characterisation as proton conductors at 120°C and low humidity. The membranes had not only high proton conductivities, up to 4 × 10-3 S cm-1 at 120°C and low relative humidity (5 and 10%), but also had good mechanical properties with a storage modulus of about 3 GPa at 300°C and high thermal stability with Tg up to around 420°C. Because of their superior ion conducting and mechanical properties they have potential as a proton conducting membrane for fuel cell applications, in particular at high temperature and extremely low-humidity conditions.

Original languageEnglish (US)
Pages (from-to)209-216
Number of pages8
JournalFuel Cells
Volume8
Issue number3-4
DOIs
StatePublished - Jul 1 2008

Keywords

  • Fuel cells
  • Polymer-electrolyte membrane
  • Polyoxadiazole
  • Polytriazole
  • Proton conductor

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology

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