SPI/S-BEA复合质子交换膜的制备及电池性能  

Preparation and Fuel Cell Performances of SPI / S-BEA Composite Proton Exchange Membranes

作　　者：陈康成[1] 韩丁波 赵之平[1] 刘文芳[1] 

机构地区：[1]北京理工大学化工与环境学院,北京100081

出　　处：《高分子学报》2015年第6期633-640,共8页Acta Polymerica Sinica

基　　金：国家自然科学基金青年基金(基金号21306010);教育部博士点新教师基金(基金号20121101120037);校基础研究基金(基金号20121042002)资助项目

摘　　要：通过在磺化聚酰亚胺(SPI)中加入具有高温保水功能的无机纳米粒子磺化多孔沸石(S-BEA)制备SPI/S-BEA复合质子交换膜(PEM).扫描电镜显示当S-BEA含量为10%时(H1),无机颗粒较为均一的分散在SPI PEM中,当S-BEA的含量提高到20%时(H2),无机颗粒团聚增多,可明显观察到有机/无机宏观相分离界面.SPI/S-BEA复合PEM H1的离子交换容量(IEC)较SPI PEM M1下降了12%,由于S-BEA粒子的存在,吸水率并未有下降,膜中单位磺酸基团的水分子摩尔数从原来的23提高到10%杂化量时的26.由于无机颗粒表面的羟基和高分子链的氢键作用,复合PEM在干燥和润湿环境下的尺寸变化并无明显增加,且保持良好的机械性能.适量加入S-BEA的复合PEM的IEC值虽然有所下降,但低湿度下的质子传导率并未明显降低.当S-BEA含量达到20%时,其明显的宏观相分离界面不利于质子在膜内的有效传导,质子传导率有所下降.燃料电池性能测试表明,在90℃下,SPI/S-BEA复合PEM H1与SPI PEM M1相比较并未有明显的提高.当电池温度提高到110℃后,由于无机粒子S-BEA的高温保水性能,复合PEM的电池性能要明显好于SPI PEM,如H1电池最大输出功率为0.61 W cm-2,相对M1提高了30%.Sulfonated porous zeolite（ S-BEA） composite sulfonated polyimide（ SPI） proton exchange membranes were prepared by mixing inorganic nanoparticles S-BEA with SPI solution. Scanning electron microscopy showed that inorganic particles S-BEA were fairly uniform dispersed in the SPI PEM,when the SBEA content was 10%（ H1）. The agglomerated inorganic particles increased with the content up to 20%（ H2）,the macro-phase interface separation was clearly observed. The ion exchange capacity（ IEC） value of S-BEA composite PEM H1 was decreased by 12% when compared to that of M1 without composite,the water uptake of H1 barely decreased due to the existence of hydrophilic S-BEA. The number of sorbed water molecules per sulfonic acid group increased from 23 for M1 to 26 for H1. No obvious increase of membrane size change in dry / wet environment was observed for SPI / S-BEA composite PEMs due to the hydrogen bonding interaction of the hydroxyl groups on the inorganic particles surface with the polymer chain. These composited PEMs also showed excellent mechanical properties. The proton conductivity under low humidity for H1 with lower IEC value was comparable to that of M1. However,when the S-BEA content increased to 20%,the obvious macro-phase separation interface hindered the proton conducting in the PEM matrix,thus the proton conductivity of H2 decreased on the contrary. The proton exchange membrane fuel cell performance test showed H1 did not have clearly higher fuel cell performances than that of M1 at 90 ℃. When the fuel cell temperature increased to 110 ℃,due to the water retention property of inorganic particles S-BEA,H1 showed clearly better fuel cell performances than those of M1. For example,the maximum power output of SPI / S-BEA composite PEM H1 was 0. 61 W cm- 2,which was 30% higher than that of M1.

关 键 词：磺化聚酰亚胺 磺化多孔沸石 有机/无机复合 质子交换膜 燃料电池 

分 类 号：TM911.4[电气工程—电力电子与电力传动]