High-performance tetracyclic aromatic anion exchange membranes containing twisted binaphthyl for fuel cells
High-performance tetracyclic aromatic anion exchange membranes containing twisted binaphthyl for fuel cells
复制标题
燃料电池用含扭曲联萘的高性能四环芳香族阴离子交换膜
DOI：
10.1016/j.memsci.2022.120578
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发表时间：
2022-04-29
影响因子：
9.5
通讯作者：
Liu, Qing Lin
中科院分区：
文献类型：
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作者：
Gao, Wei Ting;Gao, Xue Lang;Liu, Qing Lin
高性能阴离子交换膜（AEMs）的开发已成为燃料电池的迫切需要。其中一个关键的挑战是制备具有足够离子导电性和强碱性的AEMs。在这项工作中，通过一锅超强酸催化聚合将笨重的扭曲双萘基单元引入AEMs的骨架中，以提高导电性和稳定性。二萘基单元可以抑制链堆积密度，扩大AEMs的自由体积，有利于形成明确的微相分离，构建发育良好的离子导电高速公路。聚二苯基胡椒啶AEM （QABNP）的OH-电导率最高，为135.25 mS cm(-1)，优于聚四苯基胡椒啶AEM （QAQPP）的109.12 mS cm（-1）。同时，在恶劣的碱性环境（2 M NaOH, 80℃）中测试1080小时后，QABNP AEM的电导率保持率约为90%。重要的是，基于QABNP的单电池在2.37 a cm（-2）的高电流密度下具有1.16 W cm（-2）的峰值功率密度（PPD），低高频电阻（HFR）为0.04 Omega cm(2)。本研究证明了在聚合物骨架中加入大体积扭曲的二萘基对提高AEM性能的优点。
The development of high-performance anion exchange membranes (AEMs) has become more urgent for fuel cells. One of the critical challenges is to prepare AEMs with sufficient ion conductivity and robust alkaline endurance. In this work, bulky twisted binaphthyl units are introduced into the backbones of AEMs by a one-pot superacid-catalyzed polymerization to enhance both the conductivity and stability. The binaphthyl unit can depress the chain packing density and enlarge the free volume of the AEMs, conducing to form well-defined microphase separation and to build well-developed ion-conductive highways. The poly(binaphthyl piperidinium)-based AEM (QABNP) shows the highest OH- conductivity of 135.25 mS cm(-1) superior to the poly (quaterphenyl piperidinium)-based AEM (QAQPP) (109.12 mS cm(-1)). Meanwhile, the QABNP AEM exhibits about 90% conductivity retention after being tested in a harsh alkaline environment (2 M NaOH at 80 degrees C) for 1080 h. Importantly, the QABNP based single cell possesses the highest peak power density (PPD) of 1.16 W cm(-2) at a high current density of 2.37 A cm(-2) with a low high frequency resistance (HFR) of 0.04 Omega cm(2). This study demonstrates the merits of bulky twisted binaphthyl incorporated in a polymer backbone for improving AEM performances.