Electrochemical energy storage properties studies of Cu_0.2Ni_0.8O-Reduced graphene oxide nano-hybrids

Cu_0.2Ni_0.8O nano-particles and their nano-hybrids were synthesized by wet chemical methods and examined by X-ray diffraction (XRD) technique, spectroscopic analysis, Field Emission scanning electron microscopic (FESEM) technique and energy dispersive x-rays (EDX) analysis. XRD results confirmed that the synthesized materials were crystallite in the cubic phase of Cu_0.2Ni_0.8O nano-particles annealed at 500 and 800 °C. The crystallite size synthesized product was found to be around 5–20 nm. FTIR and EDX results were supporting XRD data. Morphological studies represented the spherical nature of Cu_0.2Ni_0.8O nano-particles annealed at 500 and 800 °C with particle size <70 nm. Electrochemical measurements of Cu_0.2Ni_0.8O nano-particles annealed at 500 and 800 °C and their nano-hybrids were also performed. Brilliant specific capacitance (303 F g^-1) was observed in the case of rGO-based nano-hybrid of Cu_0.2Ni_0.8O nano-particles annealed at 500 °C. This additional noted specific capacitance was credited to more conducting nature and relatively high surface area of graphene.