Carbon coated cobalt oxide (CC-CO3O4) as electrode material for supercapacitor applications

Abstract

Carbon coated cobalt oxide (CC-CO₃O₄) was prepared by colloidal processing using cobalt oxide and sucrose. Sucrose was used as a soluble carbon precursor in the preparation of CC-CO₃O₄. CC-CO₃O₄ was characterized by Brunauer–Emmett–Teller (BET) analysis, X-ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) respectively. Electrochemical properties of CC-CO₃O₄ were measured in 1 M KOH electrolyte. CC-CO₃O₄ exhibited the maximum specific capacitance of 395 F g⁻¹ at a scan rate of 5 mV s⁻¹. The enhanced electrochemical performance of CC-CO₃O₄ may be due to the increased conductivity of the composite electrode by carbon coating over the cobalt oxide nanoparticles.