Protonation of sulfonated polyi(4,4′-diphenylether-1,3,4-oxadiazole) membranes

Jerusa Roeder, Dominique Gomes, Mariela L. Ponce, Volker Abetz, Suzana Nunes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

This work describes the effect of sulfuric acid protonation on the properties of SPOD-DPE membranes using FT-IR and impedance spectroscopic analyses. The IR spectra showed the protonation of nitrogen atoms from oxadiazole rings, with a broad band complex in the region 3 000-2100 cm -1 with two centered peaks at 2 590 and 2 440 cm-1. The S=O characteristic absorption bands in SPOD-DPE and sulfuric acid were specially studied in the region of 1800-900 cm-1. The band shifts are associated to the interaction between acid groups and oxadiazole ring nitrogen atoms. The IR spectra evidenced the presence of three absorption species (HSO4 -, SO4 2- and free H 2SO4) depending on the sulfuric acid concentration. For the protonated SPOD-DPE membranes, a proton conductivity around 10 mS · cm 1 was reached at 50 °C.

Original languageEnglish (US)
Pages (from-to)467-473
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume208
Issue number5
DOIs
StatePublished - Mar 5 2007

Keywords

  • Doping
  • FT-IR
  • Fuel cells
  • Polyoxadiazole
  • Proton conductivity
  • Protonation

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Organic Chemistry
  • Physical and Theoretical Chemistry

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