Advanced dual-gradient carbon nanofibers/graphite felt composite electrode for the next-generation vanadium flow battery
作者机构：Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第136卷第5期
页 面：32-42页
核心收录：
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 07[理学] 08[工学] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0822[工学-轻工技术与工程] 0702[理学-物理学]
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).
主 题：Vanadium flow battery Dual-gradient electrode Carbon nanofibers Conductivity Electrocatalytic activity Battery performance
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.
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