2-取代咪唑衍生物掺杂高温非水用Nafion质子交换膜的制备和性能  

2-Substituted imidazole derivatives doped Nafion membrane for high temperature anhydrous application and their performance

作　　者：李薇[1] 李琼[2] 涂正凯[1,3] 张海宁[1,3] 潘牧[1,3] 

机构地区：[1]材料复合新技术国家重点实验室武汉理工大学,武汉430070 [2]武汉纺织大学材料学院,武汉430073 [3]燃料电池湖北省重点实验室武汉理工大学,武汉430070

出　　处：《中国科学：化学》2011年第12期1840-1847,共8页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(20806061);中央高校专项资金资助

摘　　要：高温质子交换膜燃料电池所面临的一个主要技术障碍是高温低湿度环境下能够具有满足电池工作条件的膜的制备.本文通过所合成的2-取代咪唑衍生物与全氟磺酸树脂的掺杂,采用溶液重铸法制备了可以在高温无水条件下工作的质子交换膜.通过2-位疏水基团的接枝,实现了非水质子传导介质的咪唑环在膜内的固定,所制备的复合质子交换膜的导质子率在160℃无水条件下达到6.8×10-3Scm-1;而且相比全氟磺酸均质膜,其热稳定性也有所提高.采用静电力显微镜观察到了所制备的复合质子交换膜内相互连接的离子团簇的形成;结合其质子传导活化能,提出了所制备的复合质子交换膜在120℃以下质子传导以跳跃方式为主;在120℃以上,则以咪唑环的"钟摆"形式实现质子在膜内的传输.One of the technical barriers for high temperature proton exchange membrane fuel cell is the membrane that should have reasonable proton conductivity at reduced relative humidity.In this paper,membranes containing Nafion and 2-substituted imidazole derivatives have been formed through casting process.Imidazole moieties are immobilizied inside the formed membrane though grafting of hydrophobic hydrocarbon chains at 2-position of imidazole.The proton conductivity of the so-formed membranes reaches 6.8×10^-3 S cm^-1 at 160 °C under anhydrous conditions.Compared to pristine Nafion membrane,the thermal stability of the formed membranes is enhanced.The inter-connected ionic clusters formation has been observed through electrostatic force microscopy.Based on activation energy for proton transportation,the mechanism of proton transportation below and above 120 °C is proposed.

关 键 词：咪唑衍生物 全氟磺酸树脂 质子交换膜 质子传导机理 

分 类 号：TM911.4[电气工程—电力电子与电力传动]