Recent advancements in anion exchange membrane fuel cells (AEMFCs) have been primarily driven by improvements in anion exchange membranes (AEMs). Aryl ether bond‐free membranes have emerged as a promising avenue for enhancing the performance of AEMs. In this study, a novel side‐chain polymer, PBTP‐s‐x, possesses double cationic groups, aiming at further enhancing overall performance for AEMs. The use of a twisted stereospecific backbone structure of polymerized binaphthyl and triple biphenyl monomer and grafted side chains of piperidine cationic groups not only improves the microphase separation structure of the membrane, but also improves the alkali resistance. Notably, the PBTP‐s‐100 AEMs exhibit exceptional OH‐ conductivity, reaching up to 138.21 mS cm‐1, and show outstanding mechanical properties with a tensile strength of up to 28 MPa. Additionally, PBTP‐s‐100 displays excellent durability, proved by the NMR spectral consistency and over 80% ion conductivity retention in 1 M NaOH at 60°C for 4 weeks. And PBTP‐s‐100 exhibits a higher Lowest Unoccupied Molecular Orbital (LUMO) and a larger energy gap for LOMO and Highest Occupied Molecular Orbital (HOMO) by density functional theory calculation, which indicates it possesses sterling alkaline stability. These findings highlight the potential of PBTP‐s‐100 as a highly performing polymer structure suitable for AEM.

中文翻译：

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用于阴离子交换膜燃料电池的新型侧链型双阳离子接枝聚（联萘三苯基哌啶）膜

阴离子交换膜燃料电池（AEMFC）的最新进展主要是由阴离子交换膜（AEM）的改进推动的。芳基醚无键膜已成为增强 AEM 性能的有前景的途径。在这项研究中，一种新型侧链聚合物PBTP-s-x具有双阳离子基团，旨在进一步提高AEM的整体性能。采用聚合联萘和三联苯单体的扭曲立体主链结构和哌啶阳离子基团的接枝侧链，不仅改善了膜的微相分离结构，而且提高了耐碱性。值得注意的是，PBTP-s-100 AEM 表现出优异的 OH-电导率，高达 138.21 mS cm-1，并表现出出色的机械性能，拉伸强度高达 28 MPa。此外，PBTP-s-100 显示出优异的耐用性，这一点已通过 NMR 光谱一致性以及在 60°C 1 M NaOH 中 4 周内离子电导率保留超过 80% 得到证明。通过密度泛函理论计算，PBTP-s-100表现出较高的最低未占分子轨道（LUMO）以及较大的LOMO和最高占据分子轨道（HOMO）能隙，这表明其具有良好的碱性稳定性。这些发现凸显了 PBTP-s-100 作为适用于 AEM 的高性能聚合物结构的潜力。