Robust anion conductive polymers containing perfluoroalkylene and pendant ammonium groups for high performance fuel cells
Robust anion conductive polymers containing perfluoroalkylene and pendant ammonium groups for high performance fuel cells
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DOI：
10.1039/c7ta09409d
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发表时间：
2017-12-21
影响因子：
11.9
通讯作者：
Miyatake, Kenji
中科院分区：
文献类型：
--
作者：
Ono, Hideaki;Kimura, Taro;Miyatake, Kenji
设计并合成了一系列新型含铵共聚物（QPAF-4）作为碱性燃料电池用阴离子交换膜。共聚物通过镍促进的缩聚反应制备，具有高分子量（M-w = 72.7- 276.4kDa作为前体），并且由全氟亚烷基和芴基与侧基铵基团组成。具有优化的共聚物组成和离子交换容量的QPAF-4膜表现出高的氢氧离子电导率（80 ° C下在水中为86.2 mS cm（-1））和优异的机械性能（大的断裂伸长率= 269%）。QPAF-4膜在1 M KOH中在80 ℃下进行1000小时的严格碱性稳定性测试以及1H-1 NMR光谱、溶解度和机械性能的测试后分析显示化学结构和性能的变化很小或没有变化。使用QPAF-4膜的碱性燃料电池使用肼作为燃料和氧气或空气作为氧化剂来操作，以实现515 mW cm（-2）的高最大功率密度。在恒定电流密度下运行燃料电池超过1000小时，也证实了膜的耐久性。
A novel series of ammonium-containing copolymers (QPAF-4) were designed and synthesized as anion exchange membranes for alkaline fuel cell applications. The copolymers were prepared via a nickel promoted polycondensation reaction with high molecular weights (M-w = 72.7-276.4 kDa as precursors) and were composed of perfluoroalkylene and fluorenyl groups with pendant ammonium groups. The QPAF-4 membrane with optimized copolymer composition and ion exchange capacity exhibited high hydroxide ion conductivity (86.2 mS cm(-1) in water at 80 degrees C) and excellent mechanical properties (large elongation at break = 269%). A severe alkaline stability test of the QPAF-4 membranes in 1 M KOH at 80 degrees C for 1000 h and the post-test analyses of the H-1 NMR spectra, solubility, and mechanical properties revealed minor, or no, changes in the chemical structure and properties. Alkaline fuel cells using the QPAF-4 membrane were operated using hydrazine as a fuel and oxygen or air as oxidant to achieve the high maximum power density of 515 mW cm(-2). The durability of the membrane was also confirmed in the operating fuel cell at a constant current density for longer than 1000 h.