1 research outputs found
Polymer Electrolyte Fuel Cells Based on Phosphoric Acid-Impregnated Poly(2,5-benzimidazole) Membranes
Preparation and characterization of membranes of poly(2,5-benzimidazole) (ABPBI) (as thin as 20 Mm) for polymer electrolyte
membrane fuel cells are reported. These membranes were prepared by solution casting and then impregnated in phosphoric acid
baths. Their characterization included thermogravimetric analyses, conductivity measurements, Fourier transform infrared spectroscopy,
X-ray diffraction, and scanning electron microscopy. These membranes have high thermal stability and good proton
conductivity at temperatures up to 200°C (6.2 3 1022 S cm21 at 150°C and 30% relative humidity!, similar to the well-known
commercial polybenzimidazole (PBI). ABPBI membrane-electrode assemblies (MEAs) using commercially available E-TEK Pt/C
electrodes were tested in H2 /O2 cells, obtaining power densities similar to those of PBI MEAs studied here as reference at
temperatures of up to 180°C, humidifying the reactants at room temperatureThis work was partially funded by the Ministry of Science and
Technology (Spain) MAT2001-1709-C04-01, MAT2002-04529-
C03! and was conducted within the framework of the ‘‘Red de Pilas de Combustible del CSIC’’ and ‘‘Xarxa Temà tica de Piles de Combustible’’
de la Generalitat de Catalunya. We thank the Ministry of
Science and Technology (Spain) for a predoctoral fellowship
awarded to J.A.A.Peer reviewe