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Citation: HE Rong-Huan, LI Qing-Feng, Bjerrum Niels J. Phosphoric Acid Doped Polybenzimidazole Composite Membranes for High Temperature Proton Exchange Membrane Fuel Cells[J]. Chinese Journal of Applied Chemistry, ;2006, 23(7): 697-703. shu

Phosphoric Acid Doped Polybenzimidazole Composite Membranes for High Temperature Proton Exchange Membrane Fuel Cells

1.
a Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110004;
2.
b Materials Science Group, Department of Chemistry Technical University of Denmark, DK-2800 Lyngby, Denmark

Corresponding author: HE Rong-Huan,
Received Date: 17 August 2005
Available Online: 30 December 2005

Polybenzimidazole(PBI) composite membranes were prepared.The introduced components included inorganic proton conductor,Zr(HPO₄)₂·nH₂O(ZrP) together with polysulfone(PSF) and the acid form of sulfonated polysulfone(SPSF(H)).Thermogravimetric analysis indicated that the composite membranes were thermal stable up to 400℃ for the PBI/ZrP/PSF system and 230℃ for the PBI/SPSF(H) system,respectively.Phosphoric acid doped PBI composite membranes exhibited a high conductivity at temperatures up to 200℃ under low humidity.(Single) cell tests with electrolytes of acid doped PBI composites were performed at 200℃ under atmospheric pressure and without humidification.The maximum power density of the cell with hydrogen or oxygen as the fuel gas is 0.34 W/cm² for PBI/ZrP/PSF(mass ratio 80:15:5),and 0.38 W/cm² for acid doped PBI/SPSF(0.43H),respectively.
- polybenzimidazole,
- composite membrane,
- conductivity,
- proton exchange membrane,
- fuel cell
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