Morphology Induced Effect on the Electrochemical Activity of Cobaltous Oxide Nanostructures in Potassium Hydroxide and Phosphoric Acid Media

Abstract:

The morphology of cobalt oxide / cobaltous oxide (Co₃O₄) nanostructures was controlled using different seed layer concentrations and deposition time. Co₃O₄ nanostructures were deposited on ITO glass synthesized using two step solution route. The morphological evolution of the Co₃O₄ nanostructures has been investigated using scanning electron microscopy (SEM). This has been correlated to the electrochemical activity of the material using cyclic voltammetry (CV) in a potassium hydroxide (KOH) and phosphoric acid (H₃PO₄) media. Other characterization technique such as x-ray diffraction analysis (XRD) was used to verify the crystal structures of the Co₃O₄ nanostructures. The Co₃O₄ nanostructures revealed pronounced redox peaks in a 1M KOH electrolyte which proved its high electrochemical activity. Also the redox peaks increases with the increase in scan rate which demonstrated good reversibility of a fast charge-discharge response. Varying CV curves have been observed in a 1M H₃PO₄ electrolyte which denotes the instability of Co₃O₄. The change in the morphology of Co₃O₄ certainly affects the electrochemical property of the Co₃O₄. This leads to an advance study for its promising electrochemical applications for a cleaner energy.

• Periodical: Materials Science Forum (Volume 916)
• Pages: 96-100
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.916.96
• Online since: March 2018
• Authors: John Lemuel G. Untalasco*, Abdul Rahman Mariscal, Menandro C. Marquez
• Keywords: Cobalt Oxide, Electrochemical Activity, Nanostructures, Solution Route

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