用(0.1 mol?L-1 )(NH4)2S2O8/(1 mol?L-1)盐酸溶液作引发剂，采用原位化学聚合的方法将苯胺单体聚合在Nafion®112膜基体中。扫描电镜（SEM）和能谱（EDX）测试结果表明复合膜的表面和Nafion®112膜相比有明显变化，苯胺主要聚合在膜的两侧。复合膜的红外光谱中出现明显聚苯胺（PANI）的特征吸收峰，说明苯胺成功地聚合在Nafion®112膜中。完全湿润状态下复合膜的质子电导率和Nafion®112膜相比有少许下降。甲醇渗透性能测试表明复合膜具有明显的阻醇作用，NF/PANI-2膜的甲醇渗透率值是1.83×10-6 cm2?s-1和Nafion®112膜相比降低了44%。相应地由NF/PANI-2膜组装的直接甲醇燃料电池（DMFC）开路电压值比Nafion®112膜的提高了7%，最大功率密度提高了30%。
关键词： PANI；Nafion®112膜；质子电导率；甲醇渗透率；直接甲醇燃料电池

Aniline monomer had been polymerized in Nafion®112 membrane using (0.1 mol?L-1)(NH4)2S2O8 /(1 mol?L-1) HCl solution as oxidant by an in situ chemical polymerization method. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) measurements indicated that there was an obvious difference between the plane of the composite membrane and Nafion®112 membrane, polyaniline (PANI) was mainly located in the two sides of the membrane. FT-IR spectroscopy of the composite membrane showed that the characteristic bands of PANI can be observed in it which meant PANI was successfully polymerized in Nafion®112 membrane. The proton conductivity of composite membrane was slightly lower than that of Nafion®112 membrane under completely humidity conditions, but the methanol crossover of composite membranes were obviously reduced. The permeability of NF/PANI-2 membrane was 1.83×10-6 cm2?s-1 which was 44% lower than that of Nafion®112 membrane. Correspondingly the direct methanol fuel cell (DMFC) with NF/PANI-2 membrane has a 7% higher open circuit voltage (OCV) and 30% higher maximum power density than that of Nafion®112 membrane.

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