Enhanced Electrochemical Capacitive Properties of Nickel‐Cobalt Oxide Nano‐flakes Materials

Abstract

Abstract Nickel‐cobalt oxide nano‐flakes materials are successfully synthesized by a facile chemical co‐precipitation method followed by a simple calcination process. The studies show that the as‐prepared nickel‐cobalt oxides with different Ni/Co ratio are composed of NiO and Co 3 O 4 compounds. The Co 0.56 Ni 0.44 oxide material, which exhibits a mesoporous structure with a narrow distribution of pore size from 2 to 7 nm, possesses markedly enhanced charge‐discharge properties at high current density compared with the pure NiO and pure Co 3 O 4 . The Co 0.56 Ni 0.44 oxide electrode shows a specific capacitance value of 1227 F/g at 5 mA/cm 2 , which is nearly three times greater than that of the pure NiO electrode at the same current density.