Synergistic effect of electrode defect regulation and Bi catalyst deposition on the performance of iron–chromium redox flow battery

作     者：Quan Xu Siyang Wang Chunming Xu Xinyi Chen Senwei Zeng Chuanyuan Li Yang Zhou Tianhang Zhou Yingchun Niu Quan Xu;Siyang Wang;Chunming Xu;Xinyi Chen;Senwei Zeng;Chuanyuan Li;Yang Zhou;Tianhang Zhou;Yingchun Niu

作者机构：State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum-BeijingBeijing 102249China 

出 版 物：《中国化学快报:英文版》 (Chinese Chemical Letters)

年 卷 期：2023年第34卷第10期

页      面：281-286页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(No.52211530034) General project of Beijing Natural Science Fund(No.3222018)。 

主　　题：Bismuth Iron-chromium redox flow batteries (ICRFBs) Carbon cloth Electrode catalyst Defect engineering 

摘      要：Iron-chromium redox flow batteries (ICRFBs) possess advantages of high safety,long cycle time,and lowcost.Increasing Cr^(3+)/Cr^(2+)reaction activity is suggested as one of the most promising strategies to improve the performance and prolong the lifetime of ICRFBs.To improve the slow reaction kinetics of the negative electrode,a type of defected carbon cloth with Bismuth (Bi) catalyst introduction is prepared by defect engineering method and electrochemical deposition,which provided defect sites and active sites to catalyze the redox couple’s reaction of ICRFBs.Furthermore,this modified carbon cloth adsorbs Cr(Ⅲ)hydrate more easily,which has a more stable structure and can significantly improve the performance of ICRFBs.Both experimental analysis and theoretical calculation indicated that the modified electrode has excellent electrocatalytic ability,which can enhance the reaction rate of Cr^(3+)/Cr^(2+),improve capacity retention and stabilize cycling performance.The capacity degradation rate of an ICRFB single cell with the modified electrodes is just 0.23%per cycle at a current density of 140 m A/cm^(2).Additionally,the energy efficiency (EE) remains around 83%,which is 8.45%higher than that of the pristine electrode assembled battery under 60 cycles.This work supplies a simple method to obtain a high-performance electrode material for ICRFBs and makes it a practical solution to promote ICFRBs large-scale commercialization process.