电化学双电层电容器电极材料——豌豆荚基活性炭的制备与表征.pdf

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1、物理化学学报(，HuaxueXuebao)ActaPhys．一Chim．S2011，27，1679一、684l679[Article]www．whxb．pku．edu．CFI电化学双电层电容器电极材料豌豆荚基活性炭的制备与表征曹国飞廖奕张小华陈金华(化学生物传感与计量学国家重点实验室，湖南大学化学化工学院，长沙410082)摘要：以豌豆荚为碳源、ZnCI或KOH为活化剂制备了活性炭，并用作叔电层电容器的电极材料．采，[打比表面及孔隙度分析仪表征了豌豆荚基活性炭的孔结构。通过KOH或ZnCl活化后，活性炭比表而积从1．69m·g。增大到2237

2、或621m·g～．采用循环伏安法和恒流充放电测试技术表征了豌豆荚基活性炭的电化学特性．结果表明：在6mol·LKOH溶液中经KOH活化处理的活性炭的质量比电容高达297．5F·g一，并具有良好的充放电稳定性，存5A·g。的高电流密度下循环充放电500次后．质量比电容仅衰减8．6％．关键词：圾电层电容器：活性炭：豌豆荚：储能：农业废料中图分类号：0646PreparationandCharacterizationofPeasecod-BasedActivatedCarbonsasElectrodeMaterialsforElectrochemi

3、calDouble—LayerCapacitorsCAOGuo—FeiLlAOYiZHANGXiao—HuaCHENJin．HuatStateKeyLaboratoryofChemo／BiosensingandChemometricsCollegeo{ChemistryandChemicalEngineeringHunanUniversity,Changsha410082．R．China1Abstract：ActivatedcarbonsforelectrochemicaIdouble．1ayercapacitorelectrodeswere

4、preparedfrOmpeasecod—basedcarbonsusingZnCl2orKOHasactivatingagents．TheporestructuresofthepreparedactivatedcarbonmaterialswerecharacterizedusingN2adsorption．Thespecificsurfaceareaofthepeasecod．basedcarbonmaterialsincreasedobviouslyfr0m1．69m-a。to2237m·g。‘byKOHactivationandto6

5、21m·q。bVZnCI2treatment．Theelectrochemicalpropertiesofthepreparedpeasecod—basedactivatedcarbonmaterialswereevaluatedbycyclicvoltammetryandgalvanostaticcharge—discharge，andaspecificcapacitanceashighas297．5F·g。in6mo1．L。KOHaqueouselectrolytewasobtainedfortheKOH—treatedcarbonmat

6、eria1．Additionally．theKOH．activatedpeasecod-basedcarbonmaterialshowedexcellentIong—termcharge—dischargecyclestabilityanda8．6％decreaseinthespecificcapacitancewasobservedatahighcurrentdensityof5A·g～after500cycles．KeyWords：Double—layercapacitor；Activatedcarbon；Peasecod；Energys

7、torage；Agriculturawaste1lntroductioncreasingenvironmentalconcerns，includingtheemissionofgreenhousegasesandlocalairpollutants，havedriventheItiswel1．-knownthatthefossil-fuelbasedenergyiscausinglotsofproblemsintheworldeconomicsandecology．Agrow—searchf0rdevelopingalternativeene

8、rgystorageorconversiondeviceswithhighpowerandenergydensities．Becauseofitsingenergy