纳米Fe_3O_4-活性炭混合超级电容器电化学性能的研究  

Electrochemical Properties of Hybrid Supercapacitor with Nanosized Fe_3O_4/activated Carbon as Electrodes

作　　者：杜嬛[1] 王成扬[1] 陈明鸣[1] 焦旸[1] 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072

出　　处：《无机材料学报》2008年第6期1193-1198,共6页Journal of Inorganic Materials

基　　金：国家高技术研究发展计划(863计划)(2006AA11A161);天津市应用基础及前沿技术研究计划重点项目(08JCZDJC17000)

摘　　要：研究了以纳米Fe_3O_4和活性炭(AC)为电极材料的超级电容器.以FeSO_4·7H_2O和氨水为原料,采用微波法制备出平均粒径为36nm的Fe_3O_4纳米粒子.组装了以6mol/L KOH溶液为电解液的Fe_3O_4/KOH/Fe_3O_4、AC/KOH/AC、Fe_3O_4/KOH/AC三种类型的模拟电容器.用循环伏安、恒流充放电和交流阻抗法对电容器进行了电化学性能测试.结果发现,混合电容器的工作电压可达到1.2V.电流密度为0.5mA/cm^2时,正/负极质量比为1.5的Fe_3O_4/KOH/AC电容器的能量密度达到9.25Wh/kg,与AC/KOH/AC电容器相比,能量密度提高了53.4%.The supercapacitor using nano-structured Fe3O4 and activated carbon（AC）as electrode materials was developed.Fe3O4 magnetic nanoparticles with average particle size of 36nm were synthe- sized by microwave method using FeSO4·7H2O and ammonia as the precipitator.Three kinds of super- capacitors,Fe3O4/KOH/Fe3O4,AC/KOH/AC,Fe3O4/KOH/AC,were prepared using 6mol/L KOH as electrolyte.Cyclic voltammetry（CV）,galvanostatic charge-discharge and electrochemical impedance spectroscopy were used to study the performance of the electrodes and the supercapacitors.The results show that the operating voltage of Fe3O4/KOH/AC hybrid supercapacitor is 1.2V.When the current density is 0.2mA/cm2 and the weight ratio of active materials（Fe3O4/AC）is 1.5,the energy density of hybrid supercapacitor is 9.25Wh/kg,which is 53.4% higher than that of AC/KOH/AC capacitor with the same electrolyte.

关 键 词：纳米FE3O4 活性炭 混合超级电容器 准电容 能量密度 

分 类 号：TM911[电气工程—电力电子与电力传动]