Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (07): 1673-1678.doi: 10.3866/PKU.WHXB20110709

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Ce-Doped Mn3O4 and Its Electrochemical Capacitive Behavior

ZHANG Zi-Yu, HU Zhong-Ai, YANG Yu-Ying, WANG Huan-Wen, CHANG Yan-Qin, CHEN Yan-Li, LEI Zi-Qiang   

  1. Key Laboratory of Polymer Materials of Gansu Province, Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, P. R. China
  • Received:2011-01-14 Revised:2011-04-08 Published:2011-06-28
  • Contact: HU Zhong-Ai E-mail:zhongai@nwnu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20963009), Natural Science Foundation of Gansu Province, China (0803RJA005) and Postgraduate Advisor Program of Education Department of Gansu Province, China.

Abstract:

Mn3O4 and Ce doped Mn3O4 were synthesized via a sol-gel route using metal nitrates as raw materials and citric acid as the chelating agent. The gel precursors were calcined at 300 ℃ for 12 h in a muffle furnace. Their morphology and structure were characterized using powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Their electrochemical performance as a supercapacitor electrode material was investigated comparatively by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge. The experimental results indicated that Ce- doping did not change the structure of Mn3O4 but greatly affected the morphology and considerably enhanced the electrochemical performance of Mn3O4. A specific capacitance of 477 F·g-1 was obtained when the mole ratio of Ce ion to total metal ions was 3%, which was 43.7% higher than that of the undoped material. Moreover, Ce-doping significantly improved the capacitance retention ability.

Key words: Sol-gel, Mn3O4, Ce, Dope, Electrochemical capacitance

MSC2000: 

  • O646