金属有机框架/离子液体增强的质子交换膜的制备及性能
Preparation and properties of proton exchange membrane reinforced by metal-organic framework/ionic liquid
孙丽君 1吕雪燕 1丁陆阳 1屈树国1
作者信息
- 1. 青岛科技大学化工学院,山东青岛266042
- 折叠
摘要
为了提高磺化聚醚醚酮/离子液体(SPEEK/IL)膜的质子电导率,降低膜中IL的流失率,采用溶液浇铸法制备了双金属Cd@Co-MOF-74/磷酸基-4-苯基咪唑离子液体([IM2][H2PO4])/SPEEK三元复合膜.结果表明,由于离子液体中的咪唑环与MOF中的—OH或羧酸基团之间形成氢键,咪唑分子被锚定在MOF的孔壁上.在120℃、Cd@Co-MOF-74掺杂的质量分数为1.5％时,三元复合膜的质子电导率最高,达到26.93 mS·cm-1.不同含量的双金属MOF/IL/SPEEK三元复合膜中IL流失率在20％～25％之间.在SPEEK/IL膜中掺杂双金属MOF在保证SPEEK膜有较高质子电导率的同时,降低了SPEEK/IL复合膜的溶胀率,进而增加了SPEEK/IL复合膜的使用寿命.
Abstract
To improve the proton conductivity of the sulfonated polyether ether ketone/ionic liquid (SPEEK/IL) membrane and reduce the loss rate of IL in the membrane,Cd@Co-MOF-74/Phosphate-4-phenylimidazole ionic liquid ([IM2][H2PO4])/SPEEK ternary composite membranes were prepared by the solution casting method. Results show that due to the formation of hydrogen bonds between the imidazole ring in ionic liquids and the—OH or carboxylic acid groups in MOF,imidazole molecules are anchored on the pore walls of MOF. The proton conductivity of the ternary composite membrane at 120 ℃ is the highest,reaching 26.93 mS·cm-1,when the mass fraction of the Cd@Co-MOF-74 doping is 1.5％. The IL loss rate of bimetallic MOF/IL/SPEEK ternary composite membranes with different contents is generally between 20％ and 25％. Doping bimetallic MOFs in SPEEK/IL membranes ensures high proton conductivity while reducing the swelling rate of SPEEK/IL composite membranes,thereby increasing their service life.
关键词
磺化聚醚醚酮/离子液体/金属有机框架/质子交换膜/质子电导率Key words
SPEEK/ionic liquid/MOF/proton exchange membrane/proton conductivity引用本文复制引用
基金项目
山东省高等学校青创科技支持计划(2020KJC005)
出版年
2024
国家科技期刊平台
NSTL
万方数据