Journal
FUEL CELLS
Volume 9, Issue 4, Pages 401-409Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.200800121
Keywords
DMFC; FTIR Spectroscopy; Impedance Spectroscopy; Polyimide; SPEEK
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A series of membranes, based on sulphonated poly(ether ether ketone) (SPEEK)/polyimide (PI) blends, was prepared at different casting conditions. They were characterised by SEM, FTIR, DMTA, DSC, TFA, water/methanol prevaporation and impedance spectroscopy. The membranes prepared at 130 degrees C from blends with 10, 20 and 30 wt.-% of PI are homogeneous, and the methanol permeabilities decreased from 28 x 10(-10) kg s(-1) m(-2) (plain SPEEK) to 7.21, 2.61 and 0.55 x 10(-10) kg m s(-1) m(-2), respectively. This corresponds to a 4- to 57-fold methanol crossover reduction. With this improvement, by the introduction of PI, the power density of SPEEK-based membranes in DMFC tests could be greatly improved.
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