磺化皂土改性直接甲醇燃料电池用Nafion膜  

Sulfonated bentonite modified Nafion membrane for direct methanol fuel cell

作　　者：田哲[1] 刘桂成[1,2] 王萌[1] 王新东[1,2] 

机构地区：[1]北京科技大学物理化学系,北京100083 [2]北京科技大学高效钢铁冶金国家重点实验室,北京100083

出　　处：《电池》2013年第3期123-126,共4页Battery Bimonthly

基　　金：国家863项目(2007AA05Z150);国家自然科学基金项目(50874008)

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Nafion 212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Nafion 212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Nafion 212膜,甲醇渗透系数比改性前降低了86%,质子导电率达到69.6 mS/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67.7 mA/cm2和61.5 mA/cm2。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℃.

关 键 词：质子交换膜 甲醇渗透 质子电导率 直接甲醇燃料电池(DMFC) 

分 类 号：TM911.42[电气工程—电力电子与电力传动]