文献类型：期刊文献

英文题名：Sulfonated Polyamine-Based Thin Film Composite Membranes with Fast and Selective Ion Transport for Vanadium Redox Flow Batteries

作者：Ji, Jinghui[1,2];Zhou, Linlong[1,2];Gu, Shuyun[1,2];Yu, Haowei[1,2];Xu, Weiyi[1,2];Zheng, Yuxuan[1,2];Li, Siyao[1,2];Xu, Zhi[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：64

期号：50

起止页码：24061

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20255119754885);WOS:【SCI-EXPANDED(收录号:WOS:001634114000001)】；

基金：This work was financially supported by the National Key Research & Development Program of China (Grant No. 2024YFB3815600), the National Natural Science Foundation of China (Grant Nos. 22308099, 22478109, and 23FAA02066), and the open foundation of the State Key Laboratory of Chemical Engineering (No. SKL- ChE-23B01).

语种：英文

外文关键词：Composite membranes - Cost effectiveness - Energy efficiency - Grafting (chemical) - Ion selective membranes - Ions - Nafion membranes - Thin films - Vanadium

摘要：In a vanadium flow battery (VFB) system, the design of an efficient ion conductive membrane (ICM) is crucial to break the trade-off between ion selectivity and conductivity. Thin film composite (TFC) membranes hold great promise to solve this problem. Herein, we synthesized grafted polyethylenimines (PEIs) with sulfonic acid groups and adopted them as building blocks to produce a series of TFC membranes with the similar to 80 nm-thick polyamine selective layer via interfacial polymerization (IP). The highly cross-linked polyamine network acts as a strong barrier to vanadium ions, while the negatively charged grafted sulfonic acid groups significantly improve the proton transport. The VFB equipped with the polyamine membrane exhibits enhanced performance with a Coulombic efficiency (CE) of 98.0% at a current density of 120 mA cm-2, along with an energy efficiency (EE) of 85.9%. This work provides an innovative strategy to design high-performance TFC membranes in VFB systems.