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 1M 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.