DMFC用PES/SPEEK共混阻醇质子交换膜  

Methanol Resistant Poly(Ether Sulfone)/Sulfonated Poly(Ether Ether Ketone) Blend Proton Exchange Membrane for DMFC

作　　者：黄绵延[1] 陈华艳[1] 郭剑钊[1] 王志涛[1] 许莉[1] 王宇新[1] 

机构地区：[1]天津大学化工学院化学工程联合国家重点实验室化工研究所,天津300072

出　　处：《物理化学学报》2007年第1期44-49,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(29976033);天津市科技发展计划(05YFJZJC00600)资助项目

摘　　要：将磺化聚醚醚酮(SPEEK,磺化度DS为68.3%)和聚醚砜(PES)两种聚合物共混制得PES/SPEEK共混膜.DSC研究表明两种聚合物之间具有较好的相容性,因而共混膜均匀致密,未发生大尺度相分离.PES的混入能有效降低膜的溶胀度及甲醇透过系数.纯SPEEK膜40℃时在1mol·L-1甲醇水溶液中溶胀度达到160%,45℃时就完全溶解,而含30%(w)PES的共混膜在80℃时的溶胀度仅有15%.室温下含20%-30%(w)PES的共混膜的甲醇透过系数为1×10-7cm2·s-1左右,比Nafion115膜的透过系数小一个数量级.尽管80℃下30%(w)PES/SPEEK共混膜的电导率与Nafion115膜相当,但由于共混膜的厚度比Nafion115膜小1/3左右,膜电阻较小,因而其电池性能比Nafion115膜的好.Sulfonated poly（ether ether ketone） （SPEEK） is a very promising alternative membrane material for direct methanol fuel cells. However, with fairly high degree of sulfonation （DS）, which enables high proton conductivity, SPEEK membranes can excessively swell or even dissolve. To deal with this contradictory, poly（ether sulfone） （PES） was blended into SPEEK to prepare PES/SPEEK blend membranes by solvent evaporating. Characteristics of the blend membranes, including thermal property, swelling degree, methanol permeability, proton conductivity and single cell performance, were investigated. DSC results reveal that the two polymers show good miscibility, which results in the homogeneity of the blend membranes. Methanol permeability and swelling degree of the blend membranes are both improved efficiently. The membranes with 20%-30%（w） of PES present the methanol permeability in the order of 1× 10^-7 cm^2 ·s^-1, which is an order of magnitude lower than that of Nation 115. High proton conductivity of the blend membranes can also be achieved because of increased applicable temperature of membranes. Under 100% relative humidity, the conductivity of blend membrane with 30%（w） PES shows to be 0.078 S·cm^-1 at 80 ℃. The single cell performance of blend membrane with 30%（w） PES is better than that of Nation 115 membrane for its reduced thickness and thereby the resistance.

关 键 词：直接甲醇燃料电池 磺化聚醚醚酮 聚醚砜 共混膜 

分 类 号：TM911.4[电气工程—电力电子与电力传动]