The introduction of hydrophobic side chain structures in anion exchange membranes (AEMs) to facilitate ion transport has been widely studied; however, low or moderate hydrophobic hydrocarbon and semifluorinated side chains are insufficient to induce a high degree of microphase separation. Herein, we design and prepare poly(aryl piperidinium) AEMs with completely methylene-free perfluorinated side chains, which can maximize the thermodynamic incompatibility between main- and side chains, thus enhancing microphase separation at medium ion exchange capacities (IECs). According to the molecular dynamics study, the methylene-free perfluorinated side chain leads to better hydration of cations. The hydroxide conductivity of the methylene-free perfluorinated side chain-grafted PAP-pF-1 membrane reaches 124.9 mS cm^–1 at 80 °C, and the PAP-sF-1 with semifluorinated side chains and PAP-CH-1 with hydrocarbon side chains show lower conductivity (116.8 and 104.0 mS cm^–1). The H₂/O₂ fuel cell using the PAP-pF-1 membrane demonstrates a remarkable peak power density (1651 mW cm^–2 at 80 °C) and durability (greater than 300 h). This work provides a novel insight into enhancing microphase separation in AEMs; it opens up new possibilities for developing high-performance AEMs.

中文翻译：

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完全不含亚甲基的侧链可在中等 IEC 下实现燃料电池阴离子交换膜的显着微相分离


在阴离子交换膜（AEM）中引入疏水性侧链结构以促进离子传输已被广泛研究；然而，低或中等疏水性烃和半氟化侧链不足以引起高度的微相分离。在此，我们设计并制备了具有完全不含亚甲基的全氟化侧链的聚芳基哌啶鎓AEM，它可以最大限度地提高主链和侧链之间的热力学不相容性，从而增强中等离子交换容量（IEC）下的微相分离。根据分子动力学研究，不含亚甲基的全氟化侧链可导致阳离子更好的水合。无亚甲基的全氟侧链接枝PAP-pF-1膜在80℃时的氢氧化物电导率达到124.9 mS cm ^–1 ，而带有半氟化侧链和PAP-CH的PAP-sF-1膜的氢氧化物电导率达到124.9 mS cm ^–1 -1 具有烃侧链显示出较低的电导率（116.8 和 104.0 mS cm ^–1 ）。使用 PAP-pF-1 膜的 H ₂ /O ₂ 燃料电池表现出卓越的峰值功率密度（80 °C 时为 1651 mW cm ^–2 ）和耐久性（大于300小时）。这项工作为增强 AEM 中的微相分离提供了新的见解；它为开发高性能 AEM 开辟了新的可能性。