Side-chain-type anion exchange membranes bearing pendant quaternary ammonium groups via flexible spacers for fuel cells
Side-chain-type anion exchange membranes bearing pendant quaternary ammonium groups via flexible spacers for fuel cells
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用于燃料电池的通过柔性间隔物承载季铵侧基的侧链型阴离子交换膜
DOI：
10.1039/c6ta05090e
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Liu, Qing Lin
中科院分区：
文献类型：
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作者：
Lin, Chen Xiao;Huang, Xiao Ling;Liu, Qing Lin
为了制备碱性燃料电池（AFC）用高性能阴离子交换膜（AEMs），通过亲核缩聚、脱甲基和威廉姆森反应合成了一系列不同长度柔性间隔基的季铵化聚醚砜（PES）。原子力显微镜（AFM）相位图像显示出清晰的亲水/疏水相分离的所有侧链型AEMs。在阳离子基团和主链（苯环）之间具有己烯氧基间隔基（n = 6）的PES-n-QA膜表现出62.7 mS cm-1的最大电导率（IEC = 1.48 meq. g−1）。发现通过延长柔性间隔物的长度（n ≥ 4），AEM材料具有改善的长期碱性稳定性。具有柔性十二烯氧基间隔物的PES-12-QA膜表现出最高的碱性稳定性，其中在60 °C下浸入IM KOH水溶液中720小时后，电导率和IEC仅降低8.1%和6.9%。此外，使用PES-6-QA作为AEM的单个燃料电池性能测试显示，在60 °C下，电流密度为250 mA cm − 2时，最大功率密度为108.3 mW cm− 2。
To realize high performance anion exchange membranes (AEMs) for alkaline fuel cells (AFCs), a series of quaternized poly(ether sulfone)s (PESs) with different lengths of flexible spacers linking cationic groups and the backbone was synthesized via nucleophilic polycondensation, demethylation and Williamson reactions. Atomic force microscopy (AFM) phase images show clear hydrophilic/hydrophobic phase separation for all the side-chain-type AEMs. The PES-n-QA membrane with hexyleneoxy spacers (n = 6) between the cationic groups and backbone (benzene ring) exhibited the maximum conductivity of 62.7 mS cm−1 (IEC = 1.48 meq. g−1) at 80 °C. The AEM materials are found to have an improved long-term alkaline stability by extending the length of the flexible spacer (n ≥ 4). The PES-12-QA membrane with a flexible dodeceneoxy spacer demonstrated the highest alkaline stability, where the conductivity and IEC only decreased by 8.1% and 6.9% after immersing in a 1 M aqueous KOH solution at 60 °C for 720 h. Furthermore, the single fuel cell performance test using PES-6-QA as an AEM showed a maximum power density of 108.3 mW cm−2 at a current density of 250 mA cm−2 at 60 °C.