A simple wet-chemical synthesis, reaction mechanism, and charge storage application of cobalt oxide electrodes of different morphologies

P. S. Gaikar, S. T. Navale*, V. V. Jadhav, P. V. Shinde, D. P. Dubal, P. R. Arjunwadkar, F. J. Stadler, Mu Naushad, Ayman A. Ghfar, Rajaram S. Mane

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

In the present work, cobalt oxide (Co3O4) electrodes of different morphologies are synthesized onto a stainless-steel (SS) substrate by a simple and cost-effective wet chemical deposition method in presence of different cobalt precursors and then used for energy storage application. Chemical reactions, responsible for different morphologies, are proposed and structural elucidation and morphological evolution studies of Co3O4 electrodes are attempted. Nano-platelets, nano-needles, and nano-grass-type of surface morphologies, corroborated from the scanning electron microscopy and the transmission electron microscopy digital photoimages, for cobalt acetate, cobalt chloride, and cobalt nitrate precursors of Co3O4 electrodes are obtained, respectively. Electrochemical analysis revealed that nano-grass-type Co3O4 electrode exhibits higher specific capacity (SC) (66.40 mAh g−1 at 1 mA cm−2 current density), excellent cycle life (∼90% after 1000 cycle) and high rate capability (77%) than that of nano-platelets (23.22 mAh g−1) and nano-needles (61.22 mAh g−1)-type Co3O4 electrodes.

Original languageEnglish
Pages (from-to)151-162
Number of pages12
JournalElectrochimica Acta
Volume253
DOIs
StatePublished - 1 Nov 2017
Externally publishedYes

Keywords

  • Chemical synthesis
  • CoO
  • Electrochemical properties
  • Impedance spectroscopy

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