硅溶胶复合全氟磺酸自保湿膜的研究  

Study on silica sol and perfluorosulfonic ionomer composite self-humidified membranes

作　　者：王毅[1] 曾蓉[1] 杨金燕[1] 沈培康[1] 

机构地区：[1]中山大学光电技术与材料国家重点实验室物理科学与工程技术学院

出　　处：《电源技术》2007年第5期368-371,共4页Chinese Journal of Power Sources

基　　金：国家科技型中小企业技术创新基金无偿资助项目(05C26214401202);广东省科技厅工业攻关计划(2005A11004001);广州市科技攻关引导项目(2005Z3-D0251);广州市白云区科技局科技成果推广项目(2004-ST-8)

摘　　要：采用液相纳米硅溶胶与全氟磺酸树脂(PFSI)/二甲基甲酰胺(DMF)溶液以流延成膜法,制备了各组分分布均匀的Silica/PFSI复合质子交换膜。采用热重法(TG)、傅立叶变换红外光谱(FTIR)、交流阻抗等实验技术对膜的结构和电化学性能进行了研究,并组装了膜电极,测试了单电池在不同温度下的恒电压放电性能。结果表明,纳米Silica/PFSI复合膜具有良好的保水功效,其最快失水温度随SiO2含量的增加而增大。在无外增湿条件下,SiO2质量百分比含量为15%的Silica/PFSI复合膜电极较Nafion!112膜电极在70℃时展示了更为稳定的恒压工作性能。Liquid nano silica sol and perfluorosulfonic ionomer were used to prepare uniform Silica/PFSI composite membranes by recasting method. The corresponding physical and electrochemical characteristics of the novel inorganic/organic composite membranes were investigated by TG, FTIR, AC impedance and electrochemical techniques. Membrane electrode assembly with Silica/PFSI membrane was fabricated and a single fuel cell was tested at constant voltage. The results show that the composite membrane has a superior capacity for water retaining to keep the proton conductivity. The temperature for losing water increases with the increase of the content of silica in the membrane. The single fuel cell by using composite membrane with the SiO2 percentage of 15% has better performance than that of single fuel cell by using Nation 112 membrane at 70℃ without external humidification.

关 键 词：质子交换膜 电导率 燃料电池 硅溶胶 

分 类 号：TM911.4[电气工程—电力电子与电力传动]