Synthesis and characterization of crosslinked sulfonated poly(arylene ether sulfone) membranes for high temperature PEMFC applications

Ki Tae Park, Jeong Hwan Chun, Sang Gon Kim, Byung Hee Chun, Sung Hyun Kim

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Sulfonated poly(arylene ether sulfone) copolymers containing carboxyl groups are prepared by an aromatic substitution polymerization reaction using phenolphthalin, 3,3′-disulfonated-4,4′-dichlorodiphenyl sulfone, 4,4′-dichlorodiphenyl sulfone and 4,4′-bisphenol A as polymer electrolyte membranes for the development of high temperature polymer electrolyte membrane fuel cells. Thin, ductile films are fabricated by the solution casting method, which resulted in membranes with a thickness of approximately 50 μm. Hydroquinone is used to crosslink the prepared copolymer in the presence of the catalyst, sodium hypophosphite. The synthesized copolymers and membranes are characterized by 1H NMR, FT-IR, TGA, ion exchange capacity, water uptake and proton conductivity measurements. The water uptake and proton conductivity of the membranes are decreased with increasing the degree of crosslinking which is determined by phenolphthalin content in the copolymer (0-15 mol%). The prepared membranes are tested in a 9 cm2 commercial single cell at 80 °C and 120 °C in humidified H 2/air under different relative humidity conditions. The uncrosslinked membrane is found to perform better than the crosslinked membranes at 80 °C; however, the crosslinked membranes perform better at 120 °C. The crosslinked membrane containing 10 mol% of phenolphthalin (CPS-PP10) shows the best performance of 600 mA cm-2 at 0.6 V and better performance than the commercial Nafion® 112 (540 mA cm-2 at 0.6 V) at 120 °C and 30 % RH.

Original languageEnglish
Pages (from-to)1813-1819
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume36
Issue number2
DOIs
Publication statusPublished - 2011 Jan 1

    Fingerprint

Keywords

  • Carboxyl group
  • High temperature
  • Low humidity
  • Polymer electrolyte membrane fuel cell
  • Sulfonated Poly(arylene ether sulfone)

ASJC Scopus subject areas

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

Cite this