Abstract
This study proposes a facile cost-effective precipitation method to synthesis three-dimensional CuO/ZnO nanocubes structure to fabricate a cost-effective energy storage device. X-ray diffraction reveals that the synthesized CuO and ZnO has monoclinic and hexagonal structure without impurity. Composition and functional group are confirmed by FT-Raman studies and EDAX spectrum. High resolution Scanning Electron Microscope shows that ZnO substitution prompts spherical to cube. The optical indirect bandgap is found to be 1.77 and 1.93 eV for CuO and CuO/ZnO respectively. Electrochemical performance of three-dimensional structure of pseudocapacitive CuO/ZnO nanocubes is facilitated electron diffusion pathways and more active sites for electrochemical reactions. An electrochemical impedance study shows that the CuO/ZnO nanocubes have higher charge transfer rate. It reveals electrochemical performance with a specific capacitance of 208 F/g at a scan rate of 5 mV/s. Dielectric properties of CuO/ZnO nanocubes can be used in high-frequency device applications. The fluorescence spectrum validates that the infra-red emission from CuO and CuO/ZnO might be used in optoelectronic devices. This is the first ever report on infra-red emission and dielectric properties of CuO/ZnO nanocubes.
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