中文摘要：

以磺化皂土和正硅酸乙酯（TEOS）为掺杂物，采用溶胶-凝胶法掺杂改性Nation212膜，并制成膜电极组件（MEA）。通过计时电流、交流阻抗等测试，研究了Nation212膜改性前后的甲醇渗透系数、质子电导率及电池功率密度等。改性后的Nation212膜，甲醇渗透系数比改性前降低了86％，质子导电率达到69．6mS／cm；单体电池性能和甲醇渗透电流测试发现：改性膜制备的MEA的甲醇渗透电流密度在30℃和55℃时分别比改性前降低67．7mA／cm^2和61.5mA／cm^2。

英文摘要：

A novel proton exchange membrane with lower methanol permeation was prepared by doping sulfonated bentonite and tetraethyl orthosilicate（TEOS） into Nation 212 membrane by sol-gel method. The proton conductivity and methanol permeability coefficient of modified membrane and Nation 212 were studied by chronoamperometry and AC impedance tests. It showed that the methanol permeability coefficient of modified membrane decreased by 86% compared with Nation 212 membrane, and the modified membrane also had a good proton conductivity which reached to 69. 6 mS/cm. It was indicated by the cell tests that the membrane electrode assembly（MEA） prepared with modified membrane got better performance under the situation of relatively high temperature. The methanol crossover of MEA with modified membrane was significantly lower, which decreased respectively 67.7 mA/cm^2 and 61.5 mA/cm^2 under the different temperatures of 30℃ and 55℃.