Functionalization of polybenzimidazole-crosslinked poly(vinylbenzyl chloride) with two cyclic quaternary ammonium cations for anion exchange membranes
Functionalization of polybenzimidazole-crosslinked poly(vinylbenzyl chloride) with two cyclic quaternary ammonium cations for anion exchange membranes
复制标题
具有两个环状季铵阳离子的聚苯并咪唑交联聚（乙烯基苄基氯）的功能化用于阴离子交换膜
DOI：
10.1016/j.memsci.2017.10.062
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发表时间：
2018-02-15
影响因子：
9.5
通讯作者：
Yi, Baolian
中科院分区：
文献类型：
--
作者：
Hao, Jinkai;Jiang, Yongyi;Yi, Baolian
具有高离子电导率和良好稳定性的阴离子交换膜（AEMs）一直是AEM燃料电池长期使用的研究热点。设计、制备了一系列机械性能和化学性能稳定的PVBC/PBI交联膜，并对其进行了表征。经聚苯并咪唑（PBI）交联后，膜具有良好的柔韧性和强度，溶胀率低（小于18%）。在交联反应中引入了n -丁基取代的双荷电BDABCO，取代了传统的浸渍法，这有利于提高聚合物与BDABCO基团之间的相容性。由于亲疏水结构域之间的相分离良好，合成的AEMs家族比基于DABCO的膜表现出更高的电导率，TEM和SAXS证实了这一点。BDABCO含量高的m -BDABCO- oh - 1:3在20℃和80℃时离子电导率最高，分别为29.3和91.4 mS cm（-1）。碱性稳定性实验结果表明，在1 mol L-1 KOH的60℃溶液中浸泡超过550 h后，膜具有优异的化学稳定性。此外，使用优化后的m - bdabco - ohaemfc - 1:3制备的h -2/O-2单燃料电池在0.492 V下的峰值功率密度高达340 mW cm(-2)，膜电阻EIS小于0.1 Omega cm(2)，远小于其他AEMs。总的来说，所开发的膜表现出优异的性能，将成为一种有希望的aemfc候选材料。
The anion exchange membranes (AEMs) with both high ionic conductivity and good stability is always the research focus role for the long-term use of AEM fuel cells. A series of the mechanically and chemically stable PVBC/PBI crosslinked membranes, functionalized with N1-butyl substituted BDABCO groups, were designed, prepared and characterized. With the crosslinking by polybenzimidazole (PBI), the membranes showed good flexibility, strength and low swelling ratio (less than 18%). N1-butyl substituted doubly-charged BDABCO was introduced in the AEMs during the crosslinking reaction instead of the traditional dipping method, benefiting from the improvement compatibility between polymers and BDABCO groups. Attributing to the well-developed phase separation between hydrophilic domains and hydrophobic domains, the family of synthesized AEMs exhibited the higher conductivities than that of DABCO based membranes, which was proved by TEM and SAXS. The M-BDABCO-OH-1: 3 with high BDABCO content displayed the highest ionic conductivity of 29.3 and 91.4 mS cm(-1) at 20 and 80 degrees C, respectively. The results of alkaline stability showed that the membranes had the superior chemical stability after immersing in a 1 mol L-1 KOH at 60 degrees C solution for more than 550 h. Furthermore, the peak power density of an H-2/O-2 single fuel cell using the optimized M-BDABCO-OHAEMFCs-1: 3 was up to 340 mW cm(-2) at 0.492 V with the EIS consisting of membrane resistance less than 0.1 Omega cm(2) which was much smaller than the other AEMs. Overall, the developed membranes demonstrated the superior performance and would be a promising candidate material for AEMFCs.