Physicochemical properties and electrochemical behavior of binary manganese-cobalt oxide electrodes for supercapacitor applications

Jeng-Kuei Chang*, Ming Tsung Lee, Chiung Hui Huang, Wen Ta Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

Binary Mn-Co oxide electrodes were prepared by anodic deposition at 25 °C in a mixture of manganese acetate and cobalt acetate aqueous solutions. It was found that the Mn-to-Co content ratio in the oxide could be easily controlled by adjusting the composition of the plating solution. The chemical states of the oxides produced were analyzed using an X-ray photoelectron spectroscope, and the deposition mechanism was thus explored in this study. Chronopotentiometry was also performed to evaluate the pseudocapacitive characteristics of the oxide electrodes. The experimental results indicated that an appropriate amount of Co addition could effectively inhibit the anodic dissolution of Mn and consequently improve the electrochemical reversibility and stability of the oxide electrode. However, it was also confirmed that high Co content caused a significant reduction in the specific capacitance of the oxide.

Original languageEnglish
Pages (from-to)124-131
Number of pages8
JournalMaterials Chemistry and Physics
Volume108
Issue number1
DOIs
StatePublished - 15 Mar 2008

Keywords

  • Electrochemical properties
  • Oxides
  • Thin films
  • X-ray photo-emission spectroscopy (XPS)

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