Enhanced performance of anion exchange membranes via crosslinking of ion cluster regions for fuel cells
Enhanced performance of anion exchange membranes via crosslinking of ion cluster regions for fuel cells
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通过燃料电池离子簇区域的交联增强阴离子交换膜的性能
DOI：
10.1016/j.jpowsour.2016.07.043
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发表时间：
2016-09-30
影响因子：
9.2
通讯作者：
Liu, Qing Lin
中科院分区：
文献类型：
--
作者：
Lai, Ao Nan;Guo, Dong;Liu, Qing Lin
开发具有高氢氧化物电导率、良好尺寸稳定性和碱稳定性的阴离子交换膜（AEM）仍然是AEM燃料电池实际应用的一个挑战。在这项研究中，我们报告了一种新的策略，以制备高性能的离子交联区域的AEM。通过在酚酞单元上选择性地密集接枝离子基团，形成离子簇，离子簇进一步交联，形成亲水性离子区，合成了一系列含酚酞的聚芳醚砜交联型自组装膜。交联反应不仅提高了AEM的尺寸稳定性，而且增加了离子簇的聚集，导致形成亲水/疏水相分离的形态和离子传导通道。结果，可以实现离子传导性和尺寸稳定性的增强。交联的AEM显示出在30至80 ° C范围内52.2-143.4 mS cm（-1）的高氢氧化物电导率和在80 ° C下相对电导率与相对溶胀的极好比率。此外，交联的AEM还表现出良好的机械性能、热稳定性和碱稳定性以及理想的单电池性能。这项工作提出了一个有前途的战略，为燃料电池的高性能AEM的合成。(C)© 2016 Elsevier B. V.版权所有。
Development of anion exchange membranes (AEMs) with high hydroxide conductivity, good dimensional and alkaline stabilities is still a challenge for the practical application of AEM fuel cells. In this study, we report a new strategy to prepare high-performance AEMs with crosslinked ionic regions. A series of phenolphthalein-containing poly(arylene ether sulfone)s crosslinked AEMs was synthesized by grafting ion groups selectively and densely on the phenolphthalein units to form ion clusters that are further crosslinked to generate the hydrophilic ionic regions. The crosslinking reaction not only improved the dimensional stability of the AEMs, but also increased the aggregation of the ion clusters leading to the formation of hydrophilic/hydrophobic phase-separated morphology and ion-conducting channels. As a result, enhancements in both ion conductivity and dimensional stability can be achieved. The cross linked AEMs showed high hydroxide conductivities in the range of 52.2-143.4 mS cm(-1) from 30 to 80 degrees C and a superb ratio of relative conductivity to relative swelling at 80 degrees C. Furthermore, the crosslinked AEMs also exhibited good mechanical properties, thermal and alkaline stabilities and desirable single cell performance. This work presents a promising strategy for the synthesis of high-performance AEMs for fuel cells. (C) 2016 Elsevier B.V. All rights reserved.