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 language | English |
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Pages (from-to) | 1181-1190 |
Number of pages | 10 |
Journal | Macromolecular Research |
Volume | 20 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2012 |
Keywords
- Fuel cells
- Membranes
- Phosphoric acid.
- Polybenzimidazole
- Polybenzoxazine