A novel permselective branched sulfonated polyimide membrane containing crown ether with remarkable proton conductance and selectivity for application in vanadium redox flow battery

被引:22
|
作者
Long, Jun [1 ,2 ]
Huang, Wenheng [1 ,2 ]
Li, Jingfeng [1 ,2 ]
Yu, Yafei [1 ,2 ]
Zhang, Bo [1 ,2 ]
Li, Jinchao [1 ,2 ,3 ]
Zhang, Yaping [1 ,2 ]
Duan, Hao [4 ]
机构
[1] Southwest Univ Sci & Technol, State Key Lab Environm Friendly Energy Mat, Engn Res Ctr Biomass Mat, Minist Educ, Mianyang 621010, Peoples R China
[2] Southwest Univ Sci & Technol, Sch Mat & Chem, Mianyang 621010, Peoples R China
[3] Sichuan Univ, Sch Chem Engn, Chengdu 610065, Peoples R China
[4] Sichuan Langsheng New Energy Technol Co Ltd, Suining 629200, Peoples R China
基金
中国博士后科学基金;
关键词
Membrane; Crown ether; Branched sulfonated polyimide; Vanadium redox flow battery; COMPOSITE MEMBRANE; STABILITY;
D O I
10.1016/j.memsci.2022.121343
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
As a key component of vanadium redox flow battery (VRFB), the ideal membrane with high proton conductance together with high vanadium ions resistance is urgently required. In this work, a permselective monomer di (aminobenzo)-18-crown-6 with proper aperture of 0.26-0.32 nm is synthesized to prepare branched sulfo-nated polyimide containing crown ether (ce-bSPI-x) membranes. In virtue of the excellent balance between vanadium ions resistance and proton conductance, the ce-bSPI-60 membrane possesses the optimum physico-chemical properties among all ce-bSPI-x membranes. Subsequently, in comparison with commercial Nafion 212 membrane, the ce-bSPI-60 membrane demonstrates higher coulomb efficiencies (CEs) (96.50%-99.39%) and energy efficiencies (EEs) (69.36%-85.45%). Furthermore, the ce-bSPI-60 membrane can achieve 80% of EE at 140 mA cm-2, which is in a superior position compared with other SPI-based membranes reported in recent years. 1000-time cycles at 140 mA cm-2 without obvious structural and morphological changes proves the excellent durability of ce-bSPI-60 membrane. To sum up, the as-prepared ce-bSPI-60 membrane exhibits a great potential to match the demand of application in VRFB.
引用
收藏
页数:8
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