Synthesis of 3D nanoflower-like mesoporous NiCo2O4 N-doped CNTs nanocomposite for solid-state hybrid supercapacitor; efficient material for the positive electrode

In this research work, we report a novel method for developing ternary NiCo2O4 compounds using deep eutectic solvents (DESs) and a strategy for improving their pseudocapacitive performance. NiCo2O4 composites with Ndoped carbon nanotubes (NCNTs) were fabricated on Ni foam using a hydrothermal method. The electrochemical performance of the NiCo2O4 was altered with the change in the reaction temperature. The composite of NiCo2O4 and NCNTs demonstrated a maximum value of specific capacity of 303 mAh g-1 at a scan rate of 5 mV s-1. The specific capacity for the composite compound was 1.3-fold greater than that of the pristine NiCo2O4 sample. For practical applications, we constructed a flexible solid-state hybrid supercapacitor comprised of NiCo2O4/ NCNTs//activated carbon (AC) cells with an excellent energy density of 12.31 Wh kg- 1, outstanding power density of 8.96 kW kg- 1, and tremendous electrode stability. The three-dimensional mesoporous nanoflowers and nanotubes-like nanostructures of NiCo2O4 are well-suited for use in hybrid devices as well as convenient for flexible electronic devices.

Automated summary

In this research, a novel method was developed to synthesize ternary NiCo2O4 compounds using deep eutectic solvents, leading to improved pseudocapacitive performance. The NiCo2O4/NCNTs composite displayed enhanced specific capacity and electrode stability, making it suitable for use in hybrid supercapacitors with high energy and power densities. The unique three-dimensional nanostructures of NiCo2O4 offer potential for applications in flexible electronic devices.