PWA/silica/PFSA composite membrane for direct methanol fuel cells |
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| Authors: | Fangjian Shang Lei Li Yongming Zhang Hong Li |
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| Affiliation: | (1) School of Chemistry and Chemical Technology, Shanghai Jiaotong University, 200240 Shanghai, People’s Republic of China |
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| Abstract: | 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. |
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