Macromolecular Research, Vol.20, No.11, 1181-1190, November, 2012
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
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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 ℃. 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 ℃ 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).
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