Preparation of polybenzimidazole/lithium hydrazinium sulfate composite membranes for high-temperature fuel cell applications

Jung Woo Jung, Sung Kon Kim, Jong Chan Lee

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

PBI-LiHzS composite membranes were prepared by casting N,N'-DMAc solutions containing PBI and LiHzS, where the LiHzS contents in the membranes were between 2.5 and 10 wt.-%. LiHzS was obtained by reacting hydrazine sulfate and lithium carbonate in water. PBI-LiHzS composite membranes were thermally stable up to approximately 300 °C and their acid-absorbing capabilities were comparable to those of the pure PBI membranes. The proton conductivity of PBILiHzS composite membranes (2.12×10-2 S·cm-1 at 180 °C and 0% RH) was higher than that of pure PBI membranes when used at the same acid doping levels. The mechanical stability of the composite membranes having less than 5 wt.-% of LiHzS was found to be close to that of pure PBI membranes.

Original languageEnglish
Pages (from-to)1322-1329
Number of pages8
JournalMacromolecular Chemistry and Physics
Volume211
Issue number12
DOIs
StatePublished - 15 Jun 2010

Keywords

  • Composites
  • Lithium hydrazinium sulfate
  • Membranes
  • PEMFC
  • Polybenzimidazole

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