无机材料学报

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纳米Fe3O4- 活性炭混合超级电容器电化学性能的研究

杜 嬛, 王成扬, 陈明鸣, 焦 旸   

  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
  • 收稿日期:2008-03-10 修回日期:2008-04-28 出版日期:2008-11-20 网络出版日期:2008-11-20

Electrochemical Properties of Hybrid Supercapacitor with Nanosized Fe3O4/activated Carbon as Electrodes

DU Xuan, WANG Cheng-Yang, CHEN Ming-Ming, JIAO Yang   

  1. Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
  • Received:2008-03-10 Revised:2008-04-28 Published:2008-11-20 Online:2008-11-20

摘要: 研究了以纳米Fe3O4和活性炭(AC)为电极材料的超级电容器. 以FeSO4·7H2O和氨水为原料, 采用微波法制备出平均粒径为36nm的Fe3O4纳米粒子. 组装了以6mol/L KOH溶液为电解液的Fe3O4/KOH/Fe3O4、AC/KOH/AC、Fe3O4/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/cm2时, 正/负极质量比为1.5的Fe3O4/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%.

关键词: 纳米Fe3O4, 活性炭, 混合超级电容器, 准电容, 能量密度

Abstract: 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 synthesized by microwave method using FeSO4·7H2O and ammonia as the precipitator. Three kinds of supercapacitors, 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.

Key words: nano-structured Fe3O4, activated carbon, hybrid supercapacitor, pseudocapacitance, energy density

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