Development of imidazolium-type alkaline anion exchange membranes for fuel cell application
Development of imidazolium-type alkaline anion exchange membranes for fuel cell application
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燃料电池用咪唑类碱性阴离子交换膜的开发
DOI：
10.1016/j.memsci.2012.05.006
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发表时间：
2012-10-01
影响因子：
9.5
通讯作者：
Xu, Tongwen
中科院分区：
文献类型：
--
作者：
Ran, Jin;Wu, Liang;Xu, Tongwen
本研究报告了基于使用 1-甲基咪唑对溴甲基化聚（2,6-二甲基-1,4-苯醚）（BPPO）进行功能化的咪唑鎓型碱性阴离子交换膜（Im-AAEM）的开发。采用带有溴甲基而不是氯甲基官能团的芳香族聚合物作为基础材料，以避免需要有毒试剂的复杂的氯甲基化。 H-1 NMR 和 FT-IR 光谱数据表明合成了一系列具有受控 IEC 的膜（通过改变 1-甲基咪唑的量来实现）。由于咪唑阳离子的共轭结构，与经典的季铵型 AAEM 相比，新型 Im-AAEM 显示出增强的短期热稳定性和化学稳定性。此外，咪唑鎓盐在 NMP 和 DMSO 等极性溶剂中表现出优异的溶解度，这使得可以利用预功能化策略来合成 AAEM。因此，Im-AAEM 在 80 摄氏度下表现出高达 > 100 mS cm(-1) 的电导率，这源于溶剂浇铸工艺指导下纳米级相分离形态的建立。 H-2/O-2燃料电池测试在76 mA cm(-2)的电流密度下产生了30 mW cm(-2)的峰值功率密度；随着化学相容性咪唑基碱性离聚物的开发，该碱性离聚物可用作电极催化剂层中的离子聚合物粘合剂，这一点将得到改善。 (c) 2012 Elsevier B.V. 保留所有权利。
This study reports the development of imidazolium-type alkaline anion exchange membranes (Im-AAEMs) based on the functionalization of bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) using 1-methylimdazole. Aromatic polymers bearing bromomethyl, instead of chloromethyl, functional groups were employed as base materials to avoid complicated chloromethylation which require toxic reagents. H-1 NMR and FT-IR spectroscopic data indicated the synthesis of a series of membranes with controlled IECs (achieved by varying the amount of 1-methylimdazole). Due to the conjugated structures of imidazolium cations, the novel Im-AAEMs display enhanced short-term thermal and chemical stabilities compared with classical quaternary ammonium-type AAEMs. In addition, the imidazolium salts exhibit excellent solubility in polar solvents, such as NMP and DMSO, which allowed the exploitation of a pre-functionalized strategy for the synthesis of the AAEMs. Accordingly, the Im-AAEMs displayed conductivities up to > 100 mS cm(-1) at 80 degrees C, which derived from the establishment of a nano-scale phase-separated morphology as directed by the solvent casting process. A H-2/O-2 fuel cell test yielded a peak power density of 30 mW cm(-2) at a current density of 76 mA cm(-2); this will be improved on development of a chemical compatible imidazolium-based alkaline ionomer for use as ionic polymer binder in the electrodes' catalyst layers. (c) 2012 Elsevier B.V. All rights reserved.