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High dispersion of COF in ion conduction membranes improving
the performance of vanadium redox flow battery

Authors： FANG Tingxu1, PANG Bo1, CUI Fujun2, JIANG Xiaobin1, WU Xuemei1, HE Gaohong1

Units： 1. State Key Laboratory of Fine Chemicals, Research and Development Center of Membrane Science and Technology, Dalian University of Technology, Dalian 116024, China; 2. Panjin Institute of Industrial Technology, Dalian University of Technology, Panjin 124221, China

KeyWords： proton exchange membrane; vanadium redox flow batteries; covalent organic frameworks; high dispersion

ClassificationCode：TM912.1

year,volume(issue):pagination： 2025,45(4):95-103

Abstract：

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.

Funds：

国家自然科学基金项目（22378042， 22021005）

AuthorIntro：

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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