Abstract
Sulfonated poly(ether sulfone)(SPES)/boron phosphate(BPO4) composite membranes for application in high temperature proton exchange membrane fuel cells(PEMFCs) were successfully prepared by the sol-gel technique.The structure and performance of the obtained membranes were characterized by thermogravimetric analysis(TGA)-Fourier transform infrared(FTIR) spectroscopy,differential scanning calorimetry(DSC),and scanning electron microscopy(SEM).Results showed that the composite membranes had higher thermal stabilities and glass transition temperatures(Tg),less swelling and excellent oxidative stability.The morphology of the composite membranes indicated that BPO4 particles were uniformly distributed throughout the SPES matrix,which may facilitate proton transport.Proton conductivities of composite membranes increased as BPO4 content increased.SPES/BPO4 composite membranes showed good proton conductivities up to and above 120 ℃.SPES/BPO4 composite membranes are promising materials for possible use in PEMFCs,especially for high-temperature applications.
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