Manganese oxide film electrodes prepared by electrostatic spray deposition for electrochemical capacitors

Kyung Wan Nam, Kwang Bum Kim

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

Porous manganese oxide thin film electrodes were prepared for use in electrochemical capacitors by electrostatic spray deposition. The as-prepared manganese oxide film showed ideal capacitive behavior after potential cycling within the range of -0.1 to 0.9 V (vs saturated calomel electrode) in a 0.1 M Na2SO4 electrolyte. Analysis of the X-ray diffraction, X-ray absorption spectroscopy, and Raman scattering data during the cycling showed that the as-prepared crystalline Mn3O4 film was electrochemically oxidized to pseudocapacitive amorphous MnO2 film by the potential cycling. The effects of the film thickness and heat treatment temperature of the as-prepared manganese oxide films on the electrochemical properties were also investigated. The specific capacitance of the electrochemically oxidized amorphous MnO2 films was dependent on the film thickness, rather than on the heat treatment of the as-prepared oxide films. The specific capacitance decreased from 330 to 150 F/g as the mass (i.e., thickness) of the oxide was increased from 18 to 116 μg/cm2.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume153
Issue number1
DOIs
Publication statusPublished - 2006 Apr 10

Fingerprint

Manganese oxide
manganese oxides
electrochemical capacitors
Oxide films
sprayers
oxide films
Electrostatics
Capacitors
electrostatics
cycles
Electrodes
electrodes
heat treatment
Amorphous films
film thickness
capacitance
Film thickness
Capacitance
Heat treatment
X ray absorption spectroscopy

All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

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abstract = "Porous manganese oxide thin film electrodes were prepared for use in electrochemical capacitors by electrostatic spray deposition. The as-prepared manganese oxide film showed ideal capacitive behavior after potential cycling within the range of -0.1 to 0.9 V (vs saturated calomel electrode) in a 0.1 M Na2SO4 electrolyte. Analysis of the X-ray diffraction, X-ray absorption spectroscopy, and Raman scattering data during the cycling showed that the as-prepared crystalline Mn3O4 film was electrochemically oxidized to pseudocapacitive amorphous MnO2 film by the potential cycling. The effects of the film thickness and heat treatment temperature of the as-prepared manganese oxide films on the electrochemical properties were also investigated. The specific capacitance of the electrochemically oxidized amorphous MnO2 films was dependent on the film thickness, rather than on the heat treatment of the as-prepared oxide films. The specific capacitance decreased from 330 to 150 F/g as the mass (i.e., thickness) of the oxide was increased from 18 to 116 μg/cm2.",
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