Structure, morphology, composition, optical properties of CuO/NiO nanocomposite for electrochemical energy storage devices

Abstract

A CuO/NiO nanocomposite synthesized using a simple co-precipitation process was employed to produce a high-performance electrochemical supercapacitor. The crystal nature, particle,composition, chemical state, and optical properties were investigated using powder XRD, TEM, EDX, FTIR, XPS, and UV–visible spectroscopy respectively. The electrochemical properties of CV, GCD and EIS are measured in 1 M NaOH. At a 0.5 Ag−1 current density, the CuO/NiO composites exhibit greater capacitance (290.56 Fg-1) when compared to the individual compounds of CuO (165.20 Fg−1) and NiO (190.34 Fg−1). After 2000 cycles the CuO/NiO electrode was excellent 90% of capacity retention. The Ragone plot discovers better energy density of 4.24Wh kg−1 and power density of 10.67 kW kg−1 were provided by the CuO/NiO nanocomposites. The maximal ionic conductivity for the CuO/NiO nanocomposite is 3.56 10-4 S/cm based on the Cole-Cole plot. Furthermore, galvanostatic charge–discharge (GCD), peak current, dielectric properties of dielectric constant and electric modulus are discussed in this work. These results have indicated that the CuO/NiO nanocomposite is an excellent material for supercapacitor electrode construction.