| Fuel Cell is a kind of clean energy which is environmental-friendly with the feature of efficient, low noise emissions and is promising in the field of new energy. However,widespread applications of proton exchange membrane fuel cells are limited by the high cost of platinum(and its alloys) catalysts.AEM is one of the key components of fuel cell and ammonium cations-based anion exchange membranes(AEMs) have been extensively studied, but poor alkaline stability hinders the application of ammonium cations-based AEMs. Various imidazolium and pyrrolidinium-based cations were synthesized by changing different groups on N3 or N1 position. And test results obtained from small molecules were applied to the fabrication of corresponding AEMs which shows excellent alkaline stability.The main conclusion in this dissertation are as follows:(1) A series of N3-substituted imidazolium salts were prepared and the long time alkaline stability of synthesized imidazolium cations was characterized. The result showed that 1,2-dimethyl-3-isopropylimidazolium cation was the most stable cation among the studied cations. Meanwhile, 1,2-dimethyl-3-isopropylimidazolium showed better alkaline stability compared with trimethylbenzyl ammonium choloride under the same environment. The corresponding imidazolium-based AEMs were also prepared by photo-polymerization and the alkaline stability test proved that corresponding AEM was alkaline stable.(2) Various N1-substituted pyrrolidinium-based cations were synthesized and characterized by NMR spectrum. Alkaline stability of all the pyrrolidinium-based cations were evaluated and compared with quaternary ammonium cations in mixedsolution. N-methyl-N-ethylpyrrolidinium cation showed best alkaline stability among the studied cations and the ionic conductivity and mechanical property of N-methyl-N-ethylpyrrolidinium cation based AEMs decreased very little after 168 h test which showed excellent alkaline stability. |
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