Ultrathin free-standing electrospun carbon nanofibers web as the electrode of the vanadium flow batteries-中国Betway体育网页登陆

摘要 Ultrathinfree-standingelectrospuncarbonnanofiberweb（ECNFW）usedfortheelectrodesofthevanadiumflowbattery（VFB）hasbeenfabricatedbytheelectrospinningtechniquefollowedbythecarbonizationprocessinthisstudytoreducetheohmicpolarizationoftheVFB.Themicrostructure,surfacechemistryandelectrochemicalperformanceofECNFWcarbonizedatvarioustemperaturesfrom800to1400°Chavebeeninvestigated.TheresultsshowthatECNFWcarbonizedat1100°CexhibitsthehighestelectrocatalyticactivitytowardtheV2+/V3+redoxreaction,anditselectrocatalyticactivitydecreasesalongwiththeincreaseofcarbonizationtemperatureduetothedroopingofthesurfacefunctionalgroups.WhilefortheVO2+/VO2+redoxcouple,theelectrocatalyticactivityofECNFWcarbonizedabove1100°Cbarelychangesasthecarbonizationtemperaturerises.ItindicatesthatthesurfacefunctionalgroupscouldfunctionasthereactionsitesfortheV2+/V3+redoxcouple,buthavenotanycatalyticeffectfortheVO2+/VO2+redoxcouple.AndthesinglecelltestresultsuggeststhatECNFWcarbonizedat1100°CisapromisingmaterialastheVFBelectrodeandtheVFBwithECNFWelectrodesobtainsasuperlowinternalresistanceof250mΩcm2.

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Ultrathin free-standing electrospun carbon nanofibers web as the electrode of the vanadium flow batteries

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