Phosphoric acid doped poly(benzimidazole) (PBI) is one of excellent candidates of proton exchange membranes for high temperature (150–180°C) proton exchange membrane fuel cells (PEMFCs). However, the strong inter-polymer hydrogen bonds cause low elongation and brittleness of PBI membranes. In this work, we synthesize poly(benzimidazole) (PBI) and butylsulfonated poly(benzimidazole) (PBI-BS), in which around 22 mole% of imidazole –NH groups of PBI are grafted with sulfonated butyl groups. We show the elongation, phosphoric acid doping level, and proton conductivity of PBI can be improved by blending ∼ 20 wt% of PBI-BS in the PBI membrane, and the membrane electrode assembly prepared from PBI/PBI-BS (8/2 by wt) blend membrane has a better PEMFC performance at 140°C ∼ 180°C than that prepared from PBI membrane. It is believed that the crosslink interactions of imidazole -NH and -N=C-groups with side chain –C4H8−SO3H groups of PBI-BS reduces the inter-PBI hydrogen bonds and increases the free volume of polymers, which leads to the enhancements of the membrane toughness and phosphoric acid doping level and the PEMFC performance.
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ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology
June 14–16, 2010
Brooklyn, New York, USA
Conference Sponsors:
- Advanced Energy Systems Division
ISBN:
978-0-7918-4405-2
PROCEEDINGS PAPER
Proton Exchange Membranes Based on Blends of Poly(Benzimidazole) and Butylsulfonated Poly(Beznimidazole) for High Temperature PEMFC
Hsiu-Li Lin,
Hsiu-Li Lin
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
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Chih-Ren Hu,
Chih-Ren Hu
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
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Po-Hao Su,
Po-Hao Su
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
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Yu-Cheng Chou,
Yu-Cheng Chou
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
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Che-Yu Lin
Che-Yu Lin
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
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Hsiu-Li Lin
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
Chih-Ren Hu
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
Po-Hao Su
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
Yu-Cheng Chou
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
Che-Yu Lin
Yuan Ze University, Chung-Li, Taoyuan, Taiwan
Paper No:
FuelCell2010-33031, pp. 641-647; 7 pages
Published Online:
December 3, 2010
Citation
Lin, H, Hu, C, Su, P, Chou, Y, & Lin, C. "Proton Exchange Membranes Based on Blends of Poly(Benzimidazole) and Butylsulfonated Poly(Beznimidazole) for High Temperature PEMFC." Proceedings of the ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 2. Brooklyn, New York, USA. June 14–16, 2010. pp. 641-647. ASME. https://doi.org/10.1115/FuelCell2010-33031
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