AEMs with high ionic conductivity and excellent alkali stability are one of the cores to ensure that AEMWE achieves high performance. For the current problems of AEMs, multi-cation side chain crosslinkers present a mitigation strategy for the inherent “trade-off” between ion conductivity and mechanical strength and ensure exceptional alkali resistance. Herein, we introduced the first report on cross-linked AEMs with several hydrophilic multi-cation alkoxy chains, featuring ethylene oxide (EO). The differentiation in the hydrophilic/hydrophobic microphase separation structures, characterized by varying positions of the alkoxy chains within the three-stage multi-cation crosslinker, was explored by experiments and simulation, as well as bearing on the comprehensive performance of AEMs. Notably, EO located in the middle of multi-cations crosslinker was found to establish a coherent and ordered ion channel. QPTP-NOBN AEM exhibited the highest OH conductivity (166.6 mS cm) and demonstrated lower water uptake (44.4 %) and swelling ratio (14.5 %) at 80°C. And meticulously designed cross-linked structures, along with ether-free backbones, bestowed upon QPTP-NOBN impressive alkali stability. After being retained in 1 M KOH solutions for 1200 h, ion conductivity of QPTP-NOBN remained largely unaffected. Furthermore, QPTP-NOBN-MEA was evaluated by water electrolysis in 1 M KOH solutions at 60°C and found that the current density reached 1.8 A cm at 2.99 V.

中文翻译：

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交联聚芳基哌啶阴离子交换膜中具有高离子电导率和耐久性的多阳离子烷氧基链


具有高离子电导率和优异的碱稳定性的AEM是确保AEMWE实现高性能的核心之一。针对AEM目前存在的问题，多阳离子侧链交联剂为离子电导率和机械强度之间固有的“权衡”提供了缓解策略，并确保优异的耐碱性。在此，我们介绍了第一份关于具有多个亲水性多阳离子烷氧基链（以环氧乙烷（EO）为特征）的交联 AEM 的报告。通过实验和模拟探讨了以三级多阳离子交联剂中烷氧基链位置不同为特征的亲水/疏水微相分离结构的差异，以及对AEM综合性能的影响。值得注意的是，位于多阳离子交联剂中间的EO被发现可以建立连贯且有序的离子通道。 QPTP-NOBN AEM 在 80°C 时表现出最高的 OH 电导率 (166.6 mS cm)，并表现出较低的吸水率 (44.4%) 和溶胀率 (14.5%)。精心设计的交联结构以及无醚主链赋予 QPTP-NOBN 令人印象深刻的碱稳定性。在 1 M KOH 溶液中保留 1200 小时后，QPTP-NOBN 的离子电导率基本不受影响。此外，通过在 60°C 1 M KOH 溶液中进行水电解评估 QPTP-NOBN-MEA，发现电流密度在 2.99 V 下达到 1.8 A cm。