Benzimidazole-cross-linked proton exchange membranes for direct methanol fuel cells
- 作者：Jing Wang ; Chengji Zhao ; Mingyu Li ; Liyuan Zhang ; Jing Ni ; Wenjia Ma ; Hui Na ; huina@jlu.edu.cn
- 关键词：Amino groups ; Benzimidazole trimer ; Cross-linked membrane ; Proton exchange membrane
- 刊名：International Journal of Hydrogen Energy
- 出版年：2012
- 期刊代码：42_03603199
- 类别：ch
- 出版时间：June, 2012
- 卷：37
- 期：11
- 页码：9330-9339
- 文件大小：1048 K
摘要
Sulfonated poly(ether ether ketone)s with pendent amino groups (Am-SPEEKs) have been prepared for direct methanol fuel cells (DMFCs). With the goal of improving the dimensional stability and reducing the methanol permeability of membranes, Benzimidazole trimer is synthesized as a cross-linker. The cross-linking reaction is induced by heating at 120聽掳C for 6聽h and then the effects of different contents of cross-linker on the properties of the cross-linking membranes are investigated in detail. Combining covalent cross-linking with ionic cross-linking, the cross-linking network structure causes significant enhancement in oxidative and mechanical property. Meanwhile, water uptake, swelling ratio and methanol permeability of the membranes substantially decrease with increasing the content of cross-linker. Although the conductivity of the membranes is lower than that of the pristine membrane, the relative selectivity is much higher. All the results indicate that聽the cross-linked membrane is potential candidate as membrane for applications in fuel cells.