高耐碱性交联型聚苯醚阴离子交换膜的制备

Preparation and characterization of poly(2,6-dimethyl-1,4-phenylene oxide)based crosslinked anion exchange membranes

以溴化聚苯醚(BPPO)为主链,N,N-二甲基己胺(DMHA),N,N-二异丙基乙胺(DIEA)和三乙胺(TEA)为季铵化试剂,N,N,N′,N′-四甲基-1,6-己二胺为交联剂制备了一系列交联型阴离子交换膜(AEMs),并对交联膜物理和电化学性能进行了表征与测试.结果表明,膜具有明显的微相分离结构、高的离子电导率、优异的尺寸稳定性和化学稳定性.其中接枝N,N-二异丙基乙胺的膜(c-PPO-DIEA)离子电导率在80℃下可达到72.3 mS/cm;在1 mol/L NaOH中经480 h的耐碱性测试发现,膜c-PPO-DIEA的离子电导率能够保留80%以上,表现出良好的耐碱性;将该膜组装成单电池测试,开路电压为0.983 V,在80℃下电流密度200 mA/cm^2时其功率密度达到89 mW/cm^2.

To improve the comprehensive performance of anion exchange membranes(AEMs)for fuel cells,a seires of AEMs with different functional groups were designed and prepared.Poly(2,6-dimethyl-1,4-phenylene oxide)(PPO)was used as backbone,and 1,6-bis-(dimethylamino)-hexane(TMHDA)was used as crosslinker.Then structures and electrochemical performance of prepared AEMs were investigated.The results show that all AEMs have good hydroxide conductivity,satisfactory dimensional stability and high chemical stability.Among them,the c-PPO-DIEA membrane has the highest ionic conductivity(72.3 mS/cm,80℃).Moreover,ionic conductivity of this kind of AEM can still remain 80.2% after immersing in alkaline solution for 20 days,showing alkaline resistance.In conclusion,the c-PPO-DIEA AEM shows a great potential for application in fuel cells.