Integration of CuO nanosheets to Zn-Ni-Co oxide nanowire arrays for energy storage applications

The structure of materials in supercapacitors plays great importance in facilitating fast ion transport. Herein, we incorporated two-dimensional Cu-oxide nanosheets (2D NSs) in one-dimensional Zn-Ni-Co-oxide nanowire arrays (1D NWAs) on three-dimensional (3D) substrate. The integrated CuO/Zn-Ni-Co oxide electrode material exhibited a high specific capacity of 1261C g-1 at a current density of 1 A g-1 and retained 92.2% of its capacity after 20,000 cycles. Density functional theory-based calculations were employed to validate the structural and electronic properties of the prepared materials. Moreover, the hybrid supercapacitor (HSC) device was engineered by using the as-prepared CuO/Zn-Ni-Co oxide electrode material as a positive and integrated functionalized multi wall carbon nanotubes (MWCNTs-COOH), activated carbon (AC), and reduced graphene oxide (rGO) as negative electrode. We highlighted the variance in using two different equations for energy density calculations. The HSC device delivered a high energy density of 74 Wh kg- 1 at a power density of 1.02 kW kg- 1. We also demonstrated illumination of multiple color LEDs for >600 s. The eye-catching results demonstrated that the integrated and structured 2D NSs/1D NWAs based CuO/Zn-Ni-Co oxide from materials can be used for practical applications.

Automated summary

The study demonstrated the integration of 2D Cu-oxide nanosheets and 1D Zn-Ni-Co-oxide nanowire arrays on a 3D substrate to create a high-performance electrode material for supercapacitors. The resulting hybrid supercapacitor device showed promising energy density and power density, with the ability to power multiple color LEDs for an extended period of time.