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1、物理化学学报(WuliHuaxueXuebao)102ActaPhys.-Chim.Sin.2013,29(1),102-110January[Article]doi:10.3866/PKU.WHXB201210231www.whxb.pku.edu.cn基于羧甲基纤维素钠制备氮掺杂多孔炭及其电容性能研究*陈崇陈祥迎谢东华(合肥工业大学化学工程学院,可控化学与材料化工安徽省重点实验室,合肥230009)摘要:以羧甲基纤维素钠(NaCMC)为碳源,利用直接炭化工艺(无需进一步活化)制备多孔炭材料;然后,以CO(NH2)2为氮源,形成了氮掺杂多孔炭材料.氮的存在形式
2、包括吡啶N、石墨N和吡咯N.实验结果表明,羧甲基纤维素钠与CO(NH2)2之间的配比可以有效控制氮存在形式、含量、样品的比表面积及孔的结构等.样品的电化学性能测试表明,氮掺杂后多孔炭材料的超电容性能得到了显著提升.以carbon-N-1:20为例,其比表面积可达858m2·g-1,远高于未经氮掺杂carbon-blank的463m2·g-1,其质量比电容则由94.0F·g-1提高到了156.7F·g-1.关键词:羧甲基纤维素钠;多孔炭;氮掺杂;电容性能中图分类号:O646SynthesisofNitrogenDopedPorousCarbonsfromSodiu
3、mCarboxymethylCelluloseandtheCapacitivePerformance*CHENChongCHENXiang-YingXIEDong-Hua(AnhuiKeyLaboratoryofControllableChemistryReaction&MaterialChemicalEngineering,SchoolofChemicalEngineering,HefeiUniversityofTechnology,Anhui230009,P.R.China)Abstract:Wedemonstrateadirectcarbonization
4、methodtoprepareporouscarbonsaselectrodematerialswithoutanactivationprocess,usingsodiumcarboxymethylcellulose(NaCMC)asthecarbonsource,whicharefurtherdopedwithvaryingmassratiosofnitrogen.FromX-rayphotoelectrondata,thenitrogenspeciesincludepyridinicN,graphiticN,andpyrrolicN.Therelativem
5、assratiosofNaCMCandCO(NH2)2affectthenatureofthenitrogenspecies,dopantdosagesaswellasspecificsurfaceareasandporestructures.Thecyclicvoltammetryandgalvanostaticcharge-dischargemeasurementsin6mol·L-1KOHaqueoussolutionsrevealthatthespecificsurfaceareasandcapacitiveperformancesimproveafte
6、rnitrogen-doping.Takingcarbon-N-1:20asexample,itsS2-1BETcanreach858m·g,whichishigherthanthatofcarbon-blank(463m2·g-1)andthecorrespondingspecificcapacitancegreatlyimprovesfrom94.0to156.7F·g-1,respectively.Thepresentcarbonsareexcellentelectrodecandidatesforhigh-rateelectrochemicalcapac
7、itors.KeyWords:Sodiumcarboxymethylcellulose;Porouscarbon;Nitrogendoping;Capacitiveperformance1Introductioningelectrodematerialsforindustrialization.TheadvantagesofCarbon-basedmaterials,primarilyclosetoelectrochemicalcarbonmaterialsincludeabundance,lowcost,easyprocessing,double-layerc
8、apacitors(ED
