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高分散COF基离子传导膜提高全钒液流电池性能

作者：房庭旭¹，逄博¹，崔福军²，姜晓滨¹，吴雪梅¹，贺高红¹

单位： 1. 大连理工大学精细化工国家重点实验室，膜科学与技术研究开发中心，大连 116024； 2. 大连理工大学盘锦产业技术研究院，盘锦 124221

关键词：质子交换膜；全钒液流电池；共价有机框架；高分散

DOI号： 10.16159/j.cnki.issn1007-8924.2025.04.010

分类号： TM912.1

出版年,卷(期):页码： 2025,45(4):95-103

摘要：

提出一种单体与聚合物溶液先浇铸成前驱体膜，而后溶剂热原位生长的高分散COF复合膜制备方法。硫酸酯化聚苯并咪唑（PBIOSO3H）与磺酸氨单体间具有强氢键相互作用，可在膜中均匀分散单体并原位限域生长磺酸共价有机框架（SCOF），解决了COFs掺杂膜易团聚的问题。硫酸酯化聚苯并咪唑膜中引入SCOF后，质子传导率提高了89.7%，面电阻降低了48.6%，氢钒离子选择性提高了1.5倍。其全钒液流电池在电流密度200 mA/cm2下，能量效率达到79.5%，远高于商业化的Nafion212膜（69.9%），表明本文提出的单体浇铸原位生长制备高分散COF基离子传导膜的方法可以有效提高全钒液流电池性能。

A novel preparation method for high dispersing COF-based composite membranes was proposed through a monomer-casting followed by solvothermal in-situ growth strategy. The strong hydrogen bonding interactions between sulfonated polybenzimidazole (PBIOSO3H) and sulfonated amine monomer enabled the uniform dispersion of monomer in the precursor membrane, and the in-situ confined growth of sulfonic acid-functionalized covalent organic framework (SCOF), effectively addressing the aggregation issue of COFs in membranes. The incorporation of sulfonic COF significantly enhanced membrane performance: proton conductivity increased by 89.7%, surface resistance decreased by 48.6%, and proton/vanadium ion selectivity improved 1.5-fold. When applied in vanadium redox flow battery, the composite membrane demonstrated superior energy efficiency of 79.5% at 200 mA/cm2, outperforming commercial Nafion212 membrane (69.9%). These results validate that the proposed monomer-casting/in-situ growth approach is effective for fabricating high dispersion of COF in ion-conductive membranes, and thus effectively enhances the performance of vanadium redox flow battery.

基金项目：

国家自然科学基金项目（22378042， 22021005）

作者简介：

房庭旭（1999-），男，辽宁辽阳人，硕士研究生，主要研究方向为离子传导膜及液流电池

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