Controllable synthesis of nanohorn-like architectured cobalt oxide for hybrid supercapacitor application

Periyasamy Sivakumar, Milan Jana, Manikantan Kota, Min Gyu Jung, Aharon Gedanken, Ho Seok Park

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

We demonstrate a facile and controllable synthesis of horn-like Co3O4 nanostructures through a solvothermal process followed by calcination at different temperatures. The particle sizes and defects of the as-obtained Co3O4 nanohorns are controlled with respect to calcining temperatures, while preserving the horn-like morphology. In particular, the Co3O4 nanohorn electrodes prepared at 300 °C reveal the specific capacitance of ∼2751 F g−1 and the rate capability of 46.8%, which is greater than those of materials obtained at 350, 400, and 450 °C. In order to enlarge the potential window, a hybrid supercapacitor is configured with the Co3O4 nanohorn and activated carbon used as positive and negative electrodes, respectively. The as-fabricated hybrid supercapacitor shows high specific capacitance of ∼101 F g−1 and the rate capability of 80.5%. The energy and power densities of hybrid supercapacitor are ∼31.70 W h kg−1 and 16.71 kW kg−1, respectively, along with 91.37% of capacitance retention over 350,000 cycles. These energy and power densities of the hybrid supercapacitors are approximately 8.5 and 3.5 times greater than values of Co3O4 symmetric supercapacitor.

Original languageEnglish
Pages (from-to)147-156
Number of pages10
JournalJournal of Power Sources
Volume402
DOIs
StatePublished - 31 Oct 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Cobalt oxide
  • Electrode materials
  • High energy
  • Hybrid device
  • Nanoarchitecture
  • Supercapacitor

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