Properties, degradation and high temperature fuel cell test of different types of PBI and PBI blend membranes

Qingfeng Li, Hans Christian Rudbeck, Andreas Chromik, Jens Oluf Jensen, Chao Pan, Thomas Steenberg, Martin Calverley, Niels Bjerrum, Jochen Kerres

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Polybenzimidazoles (PBIs) with synthetically modified structures and their blends with a partially fluorinated sulfonated aromatic polyether have been prepared and characterized for high temperature proton exchange membrane fuel cells. Significant improvement in the polymer chemical stability in terms of the oxidative weight loss, molecular weight decrease and onset temperatures for the thermal SO2 and CO splitting-off was achieved with the electron-deficient polybenzimidazoles containing -S(O)(2)- and -C(CF3)(2)- bridging groups. lonical cross-linking in the form of acid-base blends was found to further improve the polymer stability and assist maintaining the membrane integrity. Upon acid doping the membrane swelling was reduced for the modified PBI and their blend membranes, which, in turn, results in enhancement of the mechanical strength, proton conductivity and high temperature fuel cell performance. (C) 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalJournal of Membrane Science
Volume347
Issue number1-2
Pages (from-to)260-270
ISSN0376-7388
DOIs
Publication statusPublished - 2010

Keywords

  • Polybenzimidazole (PBI) synthesis
  • Partially fluorinated polyether
  • Phosphoric acid
  • Blend membrane
  • Oxidative stability
  • Fuel cell

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