Stretched Recast Nafion for Direct Methanol Fuel Cells

Uniaxially stretched recast Nafion membranes were fabricated with improved fuel cell performance, as compared to Nafion 117 and nonstretched recast Nafion. The methanol permeability decreased and proton conductivity was unchanged with increasing draw ratio. At 60°C and methanol, the power density at with stretched recast Nafion was 38% higher than that with Nafion 117 and 50% higher at methanol (60 vs . At 80°C, a power density of at and a maximum power density of were obtained (vs 70 and with Nafion 117).