Ionics

, Volume 20, Issue 11, pp 1535–1546

Preparation and electrochemical performance of spherical MnOx with high capacitance

  • He-Ming Luo
  • Yan-Xia Sun
  • Feng-Bo Zhang
  • Jian-Qiang Zhang
  • Hui-Xia Feng
Original Paper

DOI: 10.1007/s11581-014-1124-1

Cite this article as:
Luo, HM., Sun, YX., Zhang, FB. et al. Ionics (2014) 20: 1535. doi:10.1007/s11581-014-1124-1

Abstract

A promising electrode material, MnOx, was prepared by chemical precipitation method using MnSO4 · H2O as manganese source and (NH4)2CO3 as precipitant. The as-prepared manganese oxide was characterized by field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), and X-ray diffraction (XRD), respectively. The effects of reaction temperature and calcination temperature on the electrochemical properties of the electrode materials were investigated. The results show that MnOx with a spherical morphology exhibits an excellent performance in the energy storage field. Under the optimal experimental conditions, the specific capacitance of pure MnOx reaches up to 592 F g−2 in the alkaline media when the current density is 5 mA cm−2 over the potential window from −0.3 to +0.4 V. The combination resistance and transfer resistance of MnOx are 0.86 and 0.08 Ω, respectively. These findings make MnOx a promising electrode material for electrochemical capacitors.

Keywords

Chemical precipitation Manganese oxides Mixed-phase Electrochemical capacitor 

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • He-Ming Luo
    • 1
  • Yan-Xia Sun
    • 1
  • Feng-Bo Zhang
    • 1
  • Jian-Qiang Zhang
    • 1
  • Hui-Xia Feng
    • 1
  1. 1.School of Petrochemical EngineeringLanzhou University of TechnologyLanzhouPeople’s Republic of China