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Novel blend membranes based on sulfonated poly(etheretherketone) (SPEEK) and sulfonated polyvinylidene fluoride-co-hexafluoropropylene (SPVDF-co-HFP) were prepared as proton exchange membranes and used in DMFC.

In this work, Fe 2 TiO 5 nanoparticles were used for improving the proton conductivity, and water and acid uptake of polybenzimidazole (PBI)-based proton exchange membranes. The nanocomposite membranes have been prepared using different amounts of Fe 2 TiO 5 nanoparticles and dispersed into a PBI membrane with the solution-casting method. The prepared membranes were then physico-chemically and electrochemically characterized for use as electrolytes in hightemperature PEMFCs. The PBI/Fe 2 TiO 5 membranes (PFT) showed a higher acid uptake and proton conductivity compared with the pure PBI membranes. The highest acid uptake (156 %) and proton conductivity (78 mS/cm at 180°C) were observed for the PBI nanocomposite membranes containing 4 wt% of Fe 2 TiO 5 nanoparticles (PFT 4 ). The PFT 4 composite membrane showed 380 mW/cm 2 power density and 760 mA/ cm 2 current density in 0.5 V at 180°C at dry condition. The above results indicated that the PFT 4 nanocomposite membranes could be utilized as proton exchange membranes for high-temperature fuel cells.