Abstract
A composite membrane, composed of 70 vol% 660 equivalent weight perfluorosulfonic acid (from 3M Company) and 30 vol% polyphenylsulfone, was fabricated and characterized. A newly developed dual fiber electrospinning method was utilized for membrane fabrication, where the two polymers were simultaneously electrospun into a dual-fiber mat. Follow-on processing converted the mat into a fully dense and functional fuel cell ion-exchange membrane with polyphenylsulfone nanofibers embedded in an ionomer matrix. The proton conductivity of the composite membrane was high, e.g., 0.070 S/cm at 80oC, 50% relative humidity. The dimensional stability of the membrane upon water uptake was excellent, with an in-plane (areal) swelling of only 5% in room temperature water.
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