Photocatalytically reduced graphite oxide electrode for electrochemical capacitors

Hsin Chieh Huang, Cheng Wei Huang, Chien Te Hsieh, Ping Lin Kuo, Jyh Ming Ting, Hsisheng Teng

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Graphene sheets are an ideal carbon material with the highest area available for electrolyte interaction and can be obtained by reducing graphite oxide (GO). This study presents the photocatalytic reduction of GO in water with mercury-lamp irradiation. The specific capacitance of the reduced GO in an H2SO4 aqueous solution reached levels as high as 220 F g-1. This is because of the double layer formation and the reversible pseudocapacitive processes caused by oxygen functionalities at the sheet periphery. The rate capability for charge storage increases with irradiation time due to the continued reduction of oxygenated sites on the graphene basal plane. Alternating current impedance analysis shows that prolonged light irradiation promotes electronic percolation in the electrode, significantly reducing the capacitive relaxation time. With a potential widow of 1 V, the resulting symmetric cells can deliver an energy level of 5 Wh kg-1 at a high power of 1000 W kg-1. These cells show superior stability, with 92% retention of specific capacitance after 20 000 cycles of galvanostatic charge-discharge.

Original languageEnglish
Pages (from-to)20689-20695
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number42
DOIs
Publication statusPublished - 2011 Oct 27

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Graphite
electrochemical capacitors
Oxides
Capacitors
graphite
Irradiation
Graphene
Electrodes
irradiation
electrodes
oxides
graphene
Capacitance
capacitance
Mercury vapor lamps
mercury lamps
cells
Relaxation time
Electron energy levels
alternating current

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

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abstract = "Graphene sheets are an ideal carbon material with the highest area available for electrolyte interaction and can be obtained by reducing graphite oxide (GO). This study presents the photocatalytic reduction of GO in water with mercury-lamp irradiation. The specific capacitance of the reduced GO in an H2SO4 aqueous solution reached levels as high as 220 F g-1. This is because of the double layer formation and the reversible pseudocapacitive processes caused by oxygen functionalities at the sheet periphery. The rate capability for charge storage increases with irradiation time due to the continued reduction of oxygenated sites on the graphene basal plane. Alternating current impedance analysis shows that prolonged light irradiation promotes electronic percolation in the electrode, significantly reducing the capacitive relaxation time. With a potential widow of 1 V, the resulting symmetric cells can deliver an energy level of 5 Wh kg-1 at a high power of 1000 W kg-1. These cells show superior stability, with 92{\%} retention of specific capacitance after 20 000 cycles of galvanostatic charge-discharge.",
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Photocatalytically reduced graphite oxide electrode for electrochemical capacitors. / Huang, Hsin Chieh; Huang, Cheng Wei; Hsieh, Chien Te; Kuo, Ping Lin; Ting, Jyh Ming; Teng, Hsisheng.

In: Journal of Physical Chemistry C, Vol. 115, No. 42, 27.10.2011, p. 20689-20695.

Research output: Contribution to journalArticle

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AU - Hsieh, Chien Te

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AU - Teng, Hsisheng

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