To develop high-performance anion exchange membranes (AEMs), the effect of the length of semi-fluoroalkyl pendants on physical and electrochemical properties of the resulting AEMs was investigated. A series of 2,5-dichlorobenzene monomers differing in semi-fluoroalkyl pendant length were synthesized and copolymerized with 2,2-bis(4-chlorophenyl)hexafluoropropane and piperidine functionalized 2,7-dichlorofluorene. The terpolymers provided bendable membranes by solution casting. The membranes with comparable ion exchange capacity (IEC = ca. 1.85 meq g⁻¹) showed similar water uptake, while the hydroxide ion conductivity increased by 24% on increasing the pendant chain from 7 to 11 carbons. The maximum ion conductivity of 112 mS cm⁻¹ (at 80 °C) was achieved for the membrane formulated with the C₁₁ pendant. C_x-QPip-n membranes showed good alkaline stability; in particular, C₁₁-QPip-1.86 retained 75% of the original conductivity after 1056 h under harsh alkaline conditions (8 M KOH at 80 °C). An alkaline water electrolysis cell assembled with the C₁₁-QPip-1.86 membrane and with a PGM-free anode catalyst (Ni_0.8Co_0.2O) showed good performance (1.0 A cm⁻² at 1.64 V) with high voltage efficiency (75%). The cell was durable for 1000 h with minor voltage change (28 μV h⁻¹) under constant current density (1.0 A cm⁻²) operation.

中文翻译：

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用于阴离子交换膜水电解槽的具有双哌啶阳离子和半氟烷基侧垂的聚（亚芳基哌啶）三元聚合物膜


为了开发高性能阴离子交换膜 (AEM)，研究了半氟烷基侧链的长度对所得 AEM 的物理和电化学性能的影响。合成了一系列半氟烷基侧链长度不同的2,5-二氯苯单体，并与2,2-双(4-氯苯基)六氟丙烷和哌啶官能化的2,7-二氯芴共聚。三元共聚物通过溶液流延提供可弯曲的膜。具有可比离子交换容量（IEC=约1.85 meq g ^-1 ）的膜显示出相似的吸水量，而当侧链从7个碳增加到11个时，氢氧根离子电导率增加了24%。使用C ₁₁悬垂物配制的膜实现了112 mS cm ^-1 （在80°C）的最大离子电导率。 C _x -QPip- n膜表现出良好的碱性稳定性；特别是，C ₁₁ -QPip-1.86 在严酷的碱性条件下（8 M KOH，80 °C）1056 小时后仍保留了原始电导率的 75%。用C ₁₁ -QPip-1.86膜和不含PGM的阳极催化剂(Ni _0.8 Co _0.2 O)组装的碱性水电解池表现出良好的性能(1.0 A cm ^-2 at 1.64 V)和高电压效率(75%) ）。该电池在恒定电流密度（ ¹ .0 A cm ^-2 )操作。