Novel cross-linked membrane for direct methanol fuel cell application: sulfonated poly(ether ether nitrile)s |
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Authors: | Penglun Zheng Mingzhen Xu Xiaobo Liu Kun Jia |
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Institution: | 1.School of Microelectronic and Solid-State Electronic, Research Branch of Advanced Functional Materials, High Temperature Resistant Polymers, and Composites Key Laboratory of Sichuan Province,University of Electronic Science and Technology of China,Chengdu,China |
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Abstract: | In order to reduce water uptake, swelling ratio, and methanol permeability in sulfonated proton exchange membranes (PEM), novel-sulfonated aromatic poly(ether ether nitrile)s-bearing pendant propenyl groups had been synthesized by direct copolymerization method. All the results showed that the propenyl groups were suitable cross-linkable groups, and that this method was an effective way to overcome the drawbacks of sulfonated polymers at high ion exchange capacity (IEC) values. By cross-linking, the water uptake, swelling ratio, and methanol diffusion could be restricted owing to the formation of compact network structure. For example, CSPEN-60 membranes showed the proton conductivity of 0.072 S cm?1 at 80 °C, while the swelling ratios and water uptake (17.9 and 60.7 %) were much lower than that of the SPEN-60 membrane (60.8 and 295.2 %). Meanwhile, a 1.1 × 10?7 cm2 s?1 of methanol diffusion was obtained which was much lower than that of Nafion 117 (14.1 × 10?7 cm2 s?1). Although the proton conductivity of the CSPEN-60 membranes is lower than that of the SPEN-60 membrane, the selectivity is much higher. The CSPEN-60 membrane exhibited the highest selectivity among the tested membranes, about 5.8 times higher compared with that of Nafion117. |
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