燃料电池用纳米改性聚苯并咪唑阴离子交换膜的制备

以环氧氯丙烷和1–甲基咪唑为原料制备新型离子液体(IL),以IL为原料对氧化石墨烯(GO)进行表面修饰制备离子液体功能化氧化石墨烯(IL–GO),以IL–GO为添加剂制备基于含氟聚苯并咪唑(FPBI)复合膜。研究了IL–GO的含量对复合膜的热稳定性、力学强度、离子电导率、离子交换容量(IEC)、吸水率、溶胀度和耐碱性等性能的影响。研究结果表明,复合膜的IEC、离子电导率和拉伸性能都随着IL–GO含量的增加而增大,当IL–GO含量为30%时其拉伸应力和拉伸弹性模量分别达到77.5 MPa和1.95 GPa,在80℃下,其最大离子电导率可达72.3 m S/cm,然而复合膜的热稳定性并没随着IL–GO含量的增加而改变。FPBI/IL–GO复合膜具有良好的稳定性,该系列阴离子交换膜有望在碱性阴离子交换膜燃料电池中得到应用。

Synthesis of Polybenzimidazole/Nano-Particles Hybrid Anion Conducting Membranes Used for Fuel Cell

Imidazolium-based ionic liquid (IL) was synthesized from epichlorohydrin and 1 –methyl imidazole,and ionic liquid functionalized graphene oxide (IL–GO) was obtained from IL and graphene oxide (GO). Different content of IL–GO was incorporated into polybenzimidazole (FPBI) to investigate the content effect on the properties of composite membranes. The effect of content of IL–GO on the thermal stability,mechanical strength,ionic conductivity,ion exchange capacity (IEC),water absorption, swelling degree and alkali resistance performance of composite film were investigated. The results show that as the content of IL–GO increases,the properties of the composite membranes,such as proton conductivity,IEC and tensile properties present an increase variation. When IL–GO content is 30%,its tensile stress and tensile elastic modulus reach 77.5 MPa and 1.95 GPa respectively. Under 80℃,its maximum ionic conductivity reach up to 72.3 mS/cm. However,the thermal stability of the composite membranes don’t dramatically change,and the composite membranes show an excellent alkaline stability. This investigation demonstrates that FPBI/IL–GO composite membranes may be promising for alkaline anion exchange membrane fuel cell applications.