Crosslinked anion exchange membrane with improved membrane stability and conductivity for alkaline fuel cells
Crosslinked anion exchange membrane with improved membrane stability and conductivity for alkaline fuel cells
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DOI：
10.1002/app.48169
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发表时间：
2019-11
影响因子：
3
通讯作者：
Lidan Wang;Y. Liu;Jianyou Wang
中科院分区：
文献类型：
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作者：
Lidan Wang;Y. Liu;Jianyou Wang
作为阴离子交换膜（AEM）燃料电池的核心部件，提高AEM的性能具有重要的现实意义。然而，很难获得既具有良好稳定性又具有高导电性的AEM。本研究通过氯甲基化、季铵化和交联反应制备了一系列AEMs。首先进行季铵化反应，以保证AEM上有丰富的季铵基团，提高膜的导电性。用N，N,N′，N′‐四亚甲基乙二胺作为交联剂，提高了膜的稳定性和力学性能。开发了一种简单、温和、经济有效的AEM合成路线。这种策略达到了电化学和物理性能的一定平衡。考察了交联反应对膜性能的影响。交联膜具有较好的尺寸稳定性（吸水率为20.2%，溶胀率为2.1%）、力学性能（55.84 MPa）和碱性稳定性，因为交联膜具有较大的位阻。相互独立的季铵化反应和交联反应不影响膜的电化学性能；在交联反应阶段，交联剂还作为季铵化剂作用，增加了AEM中反应基团的数量。因此，所得到的交联AEM具有更高的离子交换容量和离子电导率（46.4 mS cm−1）。©2019 Wiley期刊公司j:。变异较大。Sci.2019、136、48169。
As a core component of anion exchange membrane (AEM) fuel cells, it has practical significance to improve the performance of AEMs. However, it is difficult to obtain AEM with both good stability and high conductivity. In this study, a series of AEMs were prepared by chloromethylation, quaternization, and crosslinking reactions. The quaternization reaction was carried out first to ensure that there are abundant quaternary ammonium groups on AEM and enhance the conductivity of membrane.N,N,N′,N′‐tetramethylethylenediamine was used as a crosslinker to improve membrane stability and mechanical property. A simple, mild, and cost‐effective AEM synthetic route was developed. This strategy achieves a certain balance of electrochemical and physical properties. The effect of the crosslinking reactions on the property of membrane was evaluated. Crosslinked membranes have better dimensional stability (water uptake: 20.2% and swelling ratio: 2.1%), mechanical properties (55.84 MPa), and alkaline stability because crosslinked structures result in large steric hindrance. The mutually independent quaternization and crosslinking reaction do not affect the electrochemical performance of membranes; in the crosslinking reaction stage, crosslinker also reacted as quaternization agent and increased the number of reactive groups in AEM. Thus, the resulting crosslinked AEM exhibits higher ion exchange capacity and ionic conductivities (46.4 mS cm−1). © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,136, 48169.