PWA/silica/PFSA composite membrane for direct methanol fuel cells
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A novel composite membrane was prepared by incorporation of silica-included phosphotungstic acid (PWA) additive into perfluorosulfonic acid (PFSA) followed by solution casting. Physico-chemical properties of the composite membranes were studied by Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry analysis (TGA), water uptake and swelling ratio. The results of FT-IR and TGA illustrated the stability of the PWA-silica additive in the PFSA matrix. Lower PWA-silica additive loading (2.5 and 5 wt%) in the composite membranes helped to inhibit methanol crossover and enhance the proton conductivity. However, higher additive content shows decrease in both methanol resistance and proton conductivity.
KeywordsProton Conductivity Composite Membrane Direct Methanol Fuel Cell Maximum Power Density H3PW12O40
The authors would like to thank for the financial support by the Key Technology R&D Program of China (2006BAE02A04) and Sino-Canada International Project (2008DFA61590). Also we are grateful to Shandong Dongyue Polymer Material Co. Ltd. to provide the PFSA precursor materials.
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