Advanced dual-gradient carbon nanofibers/graphite felt composite electrode for the next-generation vanadium flow battery  

作　　者：Zeyu Xu Minghua Jing Jianguo Liu Chuanwei Yan Xinzhuang Fan 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Journal of Materials Science & Technology》2023年第5期32-42,共11页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China Youth Fund(No.21703263);Open project of State Key Laboratory of Heavy Oil Processing in China University of Petroleum(No.Y7F1911191).

摘　　要：Vanadium flow battery(VFB)is one of the most promising energy storage technologies because of its superior safety,reliability and cycle life,but the poor electrochemical performance at high cur-rent density limits its commercial application.Herein,an advanced design of the dual-gradient carbon nanofibers/graphite felt(DG-CNFs/GF)composite electrode is firstly proposed for the next-generation VFB with high power density.Specifically,there is a macro gradient distribution of CNFs along the thickness direction of the electrode,meanwhile a micro gradient distribution of CNFs is also existed along the ra-dial direction of a single fiber,and both the macro and micro gradient structure are verified through the physicochemical characterizations.In addition,the DG-CNFs/GF with a dual-gradient structure exhibits an excellent electrocatalytic activity and a fast mass transfer characteristic.It is worth noting that the energy conversion efficiencies,cycling stability in addition to power density of VFB with DG-CNFs/GF are much better than those with commercial GF,which make the dual-gradient DG-CNFs/GF to be a promis-ing alternative.Most importantly,the accomplishment of this work will provide a promising development direction of the highly efficient electrode for the next-generation VFB with high power density.

关 键 词：Vanadium flow battery Dual-gradient electrode Carbon nanofibers Conductivity Electrocatalytic activity Battery performance 

分 类 号：TM53[电气工程—电器] TB383.1[一般工业技术—材料科学与工程]