Improvement of active carbon fiber electrode for electric double layer capacitor by electrochemical redox pretreatment

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Abstract

Electric double layer capacitance of phenolic-resin based active carbon fiber(ACF) electrode was enhanced by an electrochemical oxidation. However, the enhanced capacitance was effectively used as a capacitor only afler an electrochemical reduction treatment. The effect of reduction treatment after oxidation of ACF electrode was evaluated by galvanic polarization, ac impedance analysis and constant current charge-discharge in 0.5 mol dm-3 H2SO4 aqueous solution. The reduction treatment made the neutral electrode potential of oxidized ACF cathodic, thus during the charging, the ACF of positive electrode worked without the side reaction of gas evolution. AC impedance analysis proved that the capacitance and resistance of oxidized ACF were effectively increased and decreased, respectively, by the reduction treatment. The XPS results of ACF suggested that the surface oxide was removed by the reduction treatment, and the capacitor performance was enhanced by the surface change.

Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalElectrochemistry
Volume64
Issue number2
Publication statusPublished - 1996
Externally publishedYes

Fingerprint

Carbon fibers
Electrodes
Capacitance
Capacitors
Phenolic resins
Electrochemical oxidation
Discharge (fluid mechanics)
Oxides
Supercapacitor
Oxidation-Reduction
carbon fiber
X ray photoelectron spectroscopy
Gases
Polarization
Oxidation

Keywords

  • Active carbon
  • Double layer capacitor
  • Electrochemical reduction

ASJC Scopus subject areas

  • Electrochemistry

Cite this

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title = "Improvement of active carbon fiber electrode for electric double layer capacitor by electrochemical redox pretreatment",
abstract = "Electric double layer capacitance of phenolic-resin based active carbon fiber(ACF) electrode was enhanced by an electrochemical oxidation. However, the enhanced capacitance was effectively used as a capacitor only afler an electrochemical reduction treatment. The effect of reduction treatment after oxidation of ACF electrode was evaluated by galvanic polarization, ac impedance analysis and constant current charge-discharge in 0.5 mol dm-3 H2SO4 aqueous solution. The reduction treatment made the neutral electrode potential of oxidized ACF cathodic, thus during the charging, the ACF of positive electrode worked without the side reaction of gas evolution. AC impedance analysis proved that the capacitance and resistance of oxidized ACF were effectively increased and decreased, respectively, by the reduction treatment. The XPS results of ACF suggested that the surface oxide was removed by the reduction treatment, and the capacitor performance was enhanced by the surface change.",
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author = "Xingjiang Liu and Toshiyuki Momma and Tetsuya Osaka",
year = "1996",
language = "English",
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journal = "Electrochemistry",
issn = "1344-3542",
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T1 - Improvement of active carbon fiber electrode for electric double layer capacitor by electrochemical redox pretreatment

AU - Liu, Xingjiang

AU - Momma, Toshiyuki

AU - Osaka, Tetsuya

PY - 1996

Y1 - 1996

N2 - Electric double layer capacitance of phenolic-resin based active carbon fiber(ACF) electrode was enhanced by an electrochemical oxidation. However, the enhanced capacitance was effectively used as a capacitor only afler an electrochemical reduction treatment. The effect of reduction treatment after oxidation of ACF electrode was evaluated by galvanic polarization, ac impedance analysis and constant current charge-discharge in 0.5 mol dm-3 H2SO4 aqueous solution. The reduction treatment made the neutral electrode potential of oxidized ACF cathodic, thus during the charging, the ACF of positive electrode worked without the side reaction of gas evolution. AC impedance analysis proved that the capacitance and resistance of oxidized ACF were effectively increased and decreased, respectively, by the reduction treatment. The XPS results of ACF suggested that the surface oxide was removed by the reduction treatment, and the capacitor performance was enhanced by the surface change.

AB - Electric double layer capacitance of phenolic-resin based active carbon fiber(ACF) electrode was enhanced by an electrochemical oxidation. However, the enhanced capacitance was effectively used as a capacitor only afler an electrochemical reduction treatment. The effect of reduction treatment after oxidation of ACF electrode was evaluated by galvanic polarization, ac impedance analysis and constant current charge-discharge in 0.5 mol dm-3 H2SO4 aqueous solution. The reduction treatment made the neutral electrode potential of oxidized ACF cathodic, thus during the charging, the ACF of positive electrode worked without the side reaction of gas evolution. AC impedance analysis proved that the capacitance and resistance of oxidized ACF were effectively increased and decreased, respectively, by the reduction treatment. The XPS results of ACF suggested that the surface oxide was removed by the reduction treatment, and the capacitor performance was enhanced by the surface change.

KW - Active carbon

KW - Double layer capacitor

KW - Electrochemical reduction

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