Development of imidazolium-type alkaline anion exchange membranes for fuel cell application

被引:211
作者
Ran, Jin [1 ]
Wu, Liang [1 ]
Varcoe, John R. [2 ]
Ong, Ai Lien [2 ]
Poynton, Simon D. [2 ]
Xu, Tongwen [1 ]
机构
[1] Univ Sci & Technol China, Sch Chem & Mat Sci, Lab Funct Membranes, CAS Key Lab Soft Matter Chem, Hefei 230026, Peoples R China
[2] Univ Surrey, Dept Chem, Guildford GU2 7XH, Surrey, England
基金
中国国家自然科学基金; 英国工程与自然科学研究理事会;
关键词
Imidazolium; Bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide); Alkaline anion exchange membranes; Fuel cells; POLYMER ELECTROLYTE; PERFORMANCE; HYDROXIDE; STABILITY; IONOMER; ETHANOL; STATE;
D O I
10.1016/j.memsci.2012.05.006
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
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.
引用
收藏
页码:242 / 249
页数:8
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