Electrochemical characterization of hydrous ruthenium oxide thin-film electrodes for electrochemical capacitor applications

Il Hwan Kim, Kwang Bum Kim

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123 Citations (Scopus)

Abstract

A hydrous ruthenium oxide (Ru O2 ·x H2 O), thin-film electrode with high specific capacitance and good high rate capability was prepared by electrostatic spray deposition for an electrochemical capacitor application. The X-ray diffraction measurements indicated that the as-prepared Ru O2 ·x H2 O transformed to crystalline Ru O2 when annealed at temperatures over 200°C. It was shown that the specific capacitance change during annealing is closely related to the change in the number of reaction sites. The specific capacitance of Ru O2 ·x H2 O increased from 510 Fg for the as-prepared thin film to a maximum value of 650 Fg and then decreased rapidly to 25 Fg during the annealing process as the structural water content was decreased. This pattern was explained in terms of the change in the number of reaction sites, as well as the change in the electron and proton conductivity during dehydration, on the basis of the structural model of a complex nanocomposite of rutile-like ruthenium oxide nanocrystals and structural water proposed by Dmowski [J. Phys. Chem. B, 106, 12677 (2002)].

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume153
Issue number2
DOIs
Publication statusPublished - 2006 Jan 20

Fingerprint

Ruthenium
Oxide films
Capacitors
Capacitance
Thin films
Oxides
Electrodes
Annealing
Proton conductivity
Dehydration
Nanocrystals
Water content
Electrostatics
Nanocomposites
Crystalline materials
X ray diffraction
Electrons
Water
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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abstract = "A hydrous ruthenium oxide (Ru O2 ·x H2 O), thin-film electrode with high specific capacitance and good high rate capability was prepared by electrostatic spray deposition for an electrochemical capacitor application. The X-ray diffraction measurements indicated that the as-prepared Ru O2 ·x H2 O transformed to crystalline Ru O2 when annealed at temperatures over 200°C. It was shown that the specific capacitance change during annealing is closely related to the change in the number of reaction sites. The specific capacitance of Ru O2 ·x H2 O increased from 510 Fg for the as-prepared thin film to a maximum value of 650 Fg and then decreased rapidly to 25 Fg during the annealing process as the structural water content was decreased. This pattern was explained in terms of the change in the number of reaction sites, as well as the change in the electron and proton conductivity during dehydration, on the basis of the structural model of a complex nanocomposite of rutile-like ruthenium oxide nanocrystals and structural water proposed by Dmowski [J. Phys. Chem. B, 106, 12677 (2002)].",
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N2 - A hydrous ruthenium oxide (Ru O2 ·x H2 O), thin-film electrode with high specific capacitance and good high rate capability was prepared by electrostatic spray deposition for an electrochemical capacitor application. The X-ray diffraction measurements indicated that the as-prepared Ru O2 ·x H2 O transformed to crystalline Ru O2 when annealed at temperatures over 200°C. It was shown that the specific capacitance change during annealing is closely related to the change in the number of reaction sites. The specific capacitance of Ru O2 ·x H2 O increased from 510 Fg for the as-prepared thin film to a maximum value of 650 Fg and then decreased rapidly to 25 Fg during the annealing process as the structural water content was decreased. This pattern was explained in terms of the change in the number of reaction sites, as well as the change in the electron and proton conductivity during dehydration, on the basis of the structural model of a complex nanocomposite of rutile-like ruthenium oxide nanocrystals and structural water proposed by Dmowski [J. Phys. Chem. B, 106, 12677 (2002)].

AB - A hydrous ruthenium oxide (Ru O2 ·x H2 O), thin-film electrode with high specific capacitance and good high rate capability was prepared by electrostatic spray deposition for an electrochemical capacitor application. The X-ray diffraction measurements indicated that the as-prepared Ru O2 ·x H2 O transformed to crystalline Ru O2 when annealed at temperatures over 200°C. It was shown that the specific capacitance change during annealing is closely related to the change in the number of reaction sites. The specific capacitance of Ru O2 ·x H2 O increased from 510 Fg for the as-prepared thin film to a maximum value of 650 Fg and then decreased rapidly to 25 Fg during the annealing process as the structural water content was decreased. This pattern was explained in terms of the change in the number of reaction sites, as well as the change in the electron and proton conductivity during dehydration, on the basis of the structural model of a complex nanocomposite of rutile-like ruthenium oxide nanocrystals and structural water proposed by Dmowski [J. Phys. Chem. B, 106, 12677 (2002)].

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