Anion exchange membranes (AEMs) are one of the most critical materials determining the fuel cell (FC) performance. From current reports, there are still many limit factors for AEMs, such as conductivity, mechanical performance, power density and durability, which greatly affect their practicality. Here, we introduce a range of arylfluoroketone monomers with different side chain lengths into the poly (aryl-alkylene) matrix material using a copolymerization strategy to get AEMs. This study aims to investigate the effect of side chain length on the performance of AEMs, such as phase separation, ion conductivity and mechanical properties. Due to the existence of long alkyl side chains, QTPNPC4 shows significant hydrophilic aggregation, outstanding OH conductivity (158.6 mS cm, 80 °C) and excellent flexibility (109.1 %). Meanwhile, QTPNPC4 exhibits remarkable ex-situ durability (96.3 %) and chemical stability (96.6 %) after soaking in a 2 M NaOH solution for 1560 h at 80 °C. In addition, the peak power density (PPD) of a single cell with QTPNPC4 reaches 927 mW cm (80 °C), and the membrane has good in-situ durability (0.689 mV h).

中文翻译：

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侧链长度对燃料电池用聚芳基亚烷基阴离子交换膜性能的影响


阴离子交换膜（AEM）是决定燃料电池（FC）性能的最关键材料之一。从目前的报道来看，AEM仍然存在许多限制因素，如导电性、机械性能、功率密度和耐用性，这极大地影响了其实用性。在这里，我们使用共聚策略将一系列具有不同侧链长度的芳基氟酮单体引入到聚（芳基-亚烷基）基质材料中以获得AEM。本研究旨在研究侧链长度对 AEM 性能的影响，例如相分离、离子电导率和机械性能。由于长烷基侧链的存在，QTPNPC4表现出显着的亲水聚集性、出色的OH电导率（158.6 mS cm，80 °C）和优异的柔韧性（109.1%）。同时，QTPNPC4 在 80°C 的 2 M NaOH 溶液中浸泡 1560 小时后表现出显着的异位耐久性 (96.3%) 和化学稳定性 (96.6%)。此外，带有QTPNPC4的单电池的峰值功率密度（PPD）达到927 mW cm（80 °C），并且膜具有良好的原位耐久性（0.689 mV h）。