Alkaline durable 2-methylimidazolium containing anion-conducting electrolyte membranes synthesized by radiation-induced grafting for direct hydrazine hydrate fuel cells
Alkaline durable 2-methylimidazolium containing anion-conducting electrolyte membranes synthesized by radiation-induced grafting for direct hydrazine hydrate fuel cells
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DOI：
10.1016/j.memsci.2018.12.002
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发表时间：
2019-03-01
影响因子：
9.5
通讯作者：
Maekawa, Yasunari
中科院分区：
文献类型：
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作者：
Yoshimura, Kimio;Hiroki, Akihiro;Maekawa, Yasunari
通过辐射诱导将2-甲基-N-乙烯基咪唑（MNVIm）和苯乙烯（St）接枝到聚（乙烯-四氟乙烯）薄膜上，制备了氢氧化聚乙烯咪唑接枝阴离子导电聚合物电解质膜（AEM）（MNVIm/St-AEM（OH）），以防止咪唑鎓基团的两种主要降解途径（即β-消除和开环水解）反应）。将MNVIm/St摩尔比为6/4、离子交换容量(IEC)为2.08 mmol g(-1)的MNVIm/St-AEM在80℃的1M氢氧化钾(KOH)中短时间内处理，将部分咪唑鎓单元转化为乙烯单体单元(En)，从而形成三元共聚物接枝膜(MNVIm/En/St-AEM) (41/26/33)，IEC 为 1.05 mmol g(-1)。 MNVIm/En/St-AEM（初始电导率：53 mS cm(-1)）在1M KOH中600小时和使用5%水合肼在1M KOH中的实际燃料在80℃下分别保持1300小时高于10 mS cm(-1)的电导率水平。通过使用具有与MNVIm/St-AEM接枝共聚物相似的聚合物结构的共聚(N-乙烯基-2-甲基-3-己基氢氧化咪唑鎓-co-St)离聚物，MNVIm/St-AEM在直接水合肼燃料电池中表现出230 mW cm(-2)的最大功率密度。该功率密度比含有N-乙烯基咪唑的AEM（NVIm/St-AEM）组装的功率密度高出三倍以上。
Through the radiation-induced grafting of 2-methyl-N-vinylimidazole (MNVIm) and styrene (St) into a poly (ethylene-co-tetrafluoroethylene) film, polyvinylimidazolium hydroxide-grafted anion-conducting polymer electrolyte membranes (AEMs) (MNVIm/St-AEM (OH)) were prepared to prevent two main degradation routes of an imidazolium group (i.e., beta-elimination and ring opening hydrolysis reactions). The treatment of MNVIm/St-AEM with a MNVIm/St molar ratio of 6/4 and an ion-exchange capacities (IEC) of 2.08 mmol g(-1) in short time in 1M potassium hydroxide (KOH) at 80 degrees C converted part of imidazolium units to ethene monomer units (En), resulting in the formation of terpolymer-grafted membranes (MNVIm/En/St-AEM) (41/26/33) with an IEC of 1.05 mmol g(-1). The MNVIm/En/St-AEM (initial conductivity: 53 mS cm(-1)) maintained conductivity levels of higher than 10 mS cm(-1) for 600 h in 1M KOH and 1300 h with an actual fuel of 5% hydrated hydrazine in 1M KOH at 80 degrees C, respectively. By using copoly(N-vinyl-2-methyl-3-hexylimidazolium hydroxide-co-St) ionomer with a polymer structure similar to that of the MNVIm/St-AEM graft copolymer, the MNVIm/St-AEM demonstrated a maximum power density of 230 mW cm(-2) in a direct hydrazine hydrate fuel cell. This power density is more than three times higher than that assembled with the N-vinylimidazole containing AEM (NVIm/St-AEM).