Proton conductive membranes based on doped sulfonated polytriazole

M. Boaventura, M. L. Ponce, L. Brandão, A. Mendes*, S. P. Nunes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


This work reports the preparation and characterization of proton conducting sulfonated polytriazole membranes doped with three different agents: 1H-benzimidazole-2-sulfonic acid, benzimidazole and phosphoric acid. The modified membranes were characterized by scanning electron microscopy (SEM), infrared spectra, thermogravimetric analysis (TGA), dynamical mechanical thermal analysis (DMTA) and electrochemical impedance spectroscopy (EIS). The addition of doping agents resulted in a decrease of the glass transition temperature. For membranes doped with 85 wt.% phosphoric acid solution proton conductivity increased up to 2·10-3 S cm-1 at 120 °C and at 5% relative humidity. The performance of the phosphoric acid doped membranes was evaluated in a fuel cell set-up at 120 °C and 2.5% relative humidity.

Original languageEnglish (US)
Pages (from-to)12054-12064
Number of pages11
JournalInternational Journal of Hydrogen Energy
Issue number21
StatePublished - Nov 2010


  • High temperature fuel cell
  • Proton conductivity
  • Sulfonated polytriazole

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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