Poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole] and poly[6-fluoro-3-(pyridin-2-yl)-3,4-dihydro-2H-benzoxazine] based polymer electrolyte membranes for fuel cells at elevated temperature

Sung Kon Kim, Taeyun Ko, Kihyun Kim, Seong Woo Choi, Jung Ock Park, Ki Hyun Kim, Chanho Pak, Hyuk Chang, Jong Chan Lee

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Cross-linked copolymer membranes were prepared by casting poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole] (PBI) solutions containing 6-fluoro-3-(pyridin-2-yl)-3,4-dihydro-2H-benzoxazine (pF) in N,N-dimethylacetamide, with subsequent step-wise heating to 220 °C. The phosphoric acid (PA) content, proton conductivity, and cell performance were found to increase with the increase in benzoxazine content in these membranes. The proton conductivities of the cross-linked copolymer membranes reached 0.09 S cm-1 at 150°C under anhydrous conditions. Membrane-electrode assemblies (MEAs), prepared using the cross-linked copolymer membranes, showed larger operating voltage, 0.71 V at 0.2 A cm-2, than those from commercially available PBI membranes. Additionally, the MEAs were durable until 1,077 cycles, with slow lifetime loss rate, -0.14 mV h-1 on in situ accelerated lifetime mode (load cycling test).

Original languageEnglish
Pages (from-to)1181-1190
Number of pages10
JournalMacromolecular Research
Volume20
Issue number11
DOIs
StatePublished - Nov 2012

Keywords

  • Fuel cells
  • Membranes
  • Phosphoric acid.
  • Polybenzimidazole
  • Polybenzoxazine

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