物理化学学报 >> 2009, Vol. 25 >> Issue (12): 2433-2437.doi: 10.3866/PKU.WHXB20091211

研究论文 上一篇    下一篇

Sn掺杂二氧化锰超级电容器电极材料

庞旭, 马正青, 左列   

  1. 中南大学材料科学与工程学院, 长沙 410083
  • 收稿日期:2009-05-26 修回日期:2009-08-14 发布日期:2009-11-27
  • 通讯作者: 马正青 E-mail:qzm1220@sohu.com

Sn Doped MnO2 Electrode Material for Supercapacitors

PANG Xu, MA Zheng-Qing, ZUO Lie   

  1. College of Material Science and Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2009-05-26 Revised:2009-08-14 Published:2009-11-27
  • Contact: MA Zheng-Qing E-mail:qzm1220@sohu.com

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摘要：

用化学液相法制备了超级电容器用的Sn掺杂二氧化锰电极材料. 采用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)光谱对电极材料的形貌和物相进行表征. 结果表明, 所得样品由直径约10 nm, 长约100 nm的棒状物粘结成200-500 nm的球状物, 晶型为δ-MnO2. 循环伏安、电化学交流阻抗和恒流充放电测试表明, 化学掺杂的比例对材料的电化学性能有较大的影响. 当Mn:Sn的摩尔比为50:1时, 电极材料的比电容达到293 F·g-1, 比未掺杂的提高了64.6%. 600次充放电循环后, 比电容稳定在275 F·g-1, 表现出良好的容量保持能力.

关键词: 超级电容器, 二氧化锰, 掺杂, 二氧化锡, 电极材料

Abstract:

Tin doped MnO2 was synthesized by chemical co-precipitation method to be used as an electrode material for supercapacitors. The morphology and structure of the products were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) spectrometry. Results showed that the products were made up of 200-500 nm spherical particles formed with 10 nm (diameter) by 100 nm (length) nanorods. And the crystallographic structure of MnO2 was the poorly crystallized δ-type. Cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS), and galvanostatic charge-discharge tests indicated that the ratio of tin in the products had great effect on the electrochemical capacity. A specific capacitance of 293 F·g-1 was obtained when the molar ratio ofMn to Sn was 50:1, which was 64.6%higher than that of the undoped material. After 600 charge-discharge cycles, the specific capacitance stabilized at 275 F·g-1, exhibiting favorable capacitance retention ability.

Key words: Supercapacitor, Manganese dioxide, Dope, Stannumdioxide, Electrode material