摘要
离子交换膜作为全钒液流电池(VRB)的核心组成,起到传输离子和阻隔钒离子渗透的作用。将全氟磺酸树脂(PFSA)和三乙烯基二胺(DABCO)盐离子化合物共混,对全氟磺酸树脂进行改性制备了两性离子共混膜。以DABCO-PFSA共混膜为研究基础,采用阴阳离子非共价相互作用的超分子交联方法制备的共混膜可以有效提高膜的综合性能。通过优化共混膜的二组分结构差异合成了聚阳离子PDABCO,并与PFSA共混,聚合物链间超分子交联赋予膜良好的机械性能和稳定性,降低了钒离子渗透,其中PDABCO-PFSA-7.5%膜的钒离子渗透率达到0.25×10^(-6)cm^(2)/min。在VRB测试中,当电流密度为160 mA/cm^(2)时,PDABCO-PFSA-7.5%膜的库伦效率(CE)达到88.43%。
As the core component of vanadium redox flow battery(VRB),ion exchange membrane plays the role of transporting ions and blocking the penetration of vanadium ions.Perfluorosulfonic acid resin(PFSA)is modified through blending it with trivinyldiamine(DABCO)salt ion compound to obtain an amphoteric ion blending membrane.Based on DABCO-PFSA blending membrane,the blending membrane prepared by supramolecular crosslinking method with non-covalent interaction of anionics and cations exhibits an improved comprehensive performance.Polycationic PDABCO is synthesized through optimizing the two-component structure difference of the blending membrane,and blended with PFSA to prepare the membrane that obtains good mechanical properties and reduces vanadium ion permeation due to the supramolecular crosslinking between polymer chains.The permeability of vanadium ion is 0.25×10^(-6) cm^(2)·min^(-1) for PDABCO-PFSA-7.5%membrane.In VRB test,the coulombic efficiency of PDABCO-PFSA-7.5%membrane reaches 88.43%at a current density of 160 mA·cm^(-2).
作者
王晓莉
郭晋婷
苟瑞婷
何振峰
WANG Xiao-li;GUO Jin-ting;GOU Rui-ting;HE Zhen-feng(School of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China)
出处
《现代化工》
CAS
CSCD
北大核心
2024年第2期150-155,161,共7页
Modern Chemical Industry
基金
山西省研究生创新项目资助(2021Y602)
山西省基础研究计划(面上项目)(20210302123070)。
关键词
两性离子共混膜
VRB
钒离子渗透
超分子交联网络
amphoteric ion blend membranes
VRB
vanadium ion permeability
supramolecular crosslinking network
