基于微孔聚四氟乙烯的复合质子交换膜  

Porous-PTFE reinforced composite membrane for fuel cell applications

作　　者：李雷[1,2] 蒋金芝[1] 尚玉明[2] 冯少广[2] 谢晓峰[2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《化工进展》2009年第8期1395-1399,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(50703021);国家高新技术研究发展计划(2007AA05Z146;2007AA05Z150;2008AA03Z205)资助项目

摘　　要：研究了基于微孔聚四氟乙烯(PTFE)的复合方式,通过将自制ABPSH40树脂——N,N-二甲基乙酰胺溶液流延在用液相介质表面处理法改性过的聚四氟乙烯微孔膜表面上,制得了均匀的ABPSH40/PTFE增强复合质子交换膜。采用扫描电镜(SEM)观察复合膜的表面及断面形态,采用气相色谱仪(GC)测定了复合膜的甲醇渗透性,利用交流阻抗(AC)测定了膜的质子传导率。结果表明,ABPSH40树脂在复合膜内分布均匀,而且PTFE膜微孔填堵充分;复合膜具有优越的尺寸稳定性,较低的甲醇渗透率和接近Nafion膜的质子传导率,和ABPSH40均质膜进行比较后的优点明显。ABPSH40/PTFE增强复合质子交换膜可望成为一种直接甲醇燃料电池用质子交换膜。ABPSH40/PTFE composite membranes were prepared by casting ABPSH40 resin solution onto the surface of modified porous PTFE films. Microstructure of the composite membranes was studied by SEM, the methanol permeability was analyzed by GC, and the proton conductivity was investigated by AC impedance. Results showed that the ABPSH40 resin is well plugged into the micropores of PTFE. Compared with ABPSH40 membranes, the dimensional stability and mechanical strength of the composite membranes are both apparently improved. The ABPSH40/PTFE composite membranes have lower methanol permeability and a comparable proton conductivity with Nafion membrane. It is prospectively that the ABPSH40/PTFE composite membranes can be used in DMFC.

关 键 词：微孔聚四氟乙烯 复合膜 甲醇渗透率 尺寸稳定性 质子传导率 燃料电池 

分 类 号：TQ15[化学工程—电化学工业]