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Taoyuan City, Taiwan

Tang T.-H.,Chung Li | Su P.-H.,Chung Li | Liu Y.-C.,Chung Li | Yu T.L.,Chung Li | Yu T.L.,Yuan Ze University
International Journal of Hydrogen Energy | Year: 2014

We synthesize polybenzimidazole (PBI; Mw = 1.65 × 10 5 g mol-1) and benzyl-methyl-phosphoric acid grafted PBI (PBI-BP; 24 mol% degree of grafting). We demonstrate that blending 20 to -40 wt.% PBI-BP in the PBI membrane enhances the H3PO4 doping level, proton conductivity, and mechanical strength. However, the membrane is highly dissolved in an 85 wt.% H3PO4 aqueous solution as the PBI-BP content in the blend membrane is larger than 50 wt.%. To prevent PBI-BP from being dissolved out of the blend membrane by the H 3PO4 aqueous solution, we fabricated a PBI/PBI-BP/epoxy (8/2/1.23 by wt.) crosslinked membrane. The crosslinked membrane demonstrated good fuel cell performance and excellent stability after a 23 on/off (12 h on at 160 °C with a current density of 200 mA cm-2 and 12 h off at room temperature) fuel cell cycle test with an unhumidified H2/O 2. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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