Carbon-modified NiCo2O4 as an electrode material for supercapacitors.

Transition metal oxides are a promising class of electrode materials for pseudocapacitors due to their high electrochemical activity and eco-friendly nature. However, they possess poor intrinsic conductivity which results in the low energy density of the assembled supercapacitors. In this study, electrodes composed of amorphous C-modified NiCo 2 O 4 (C/NiCo 2 O 4 /NF) on nickel foam substrate were prepared by electrochemical deposition and thermostatic heating method. The incorporation of amorphous C compensates for the low electrical conductivity of NiCo 2 O 4 materials, thereby significantly enhancing the electrochemical performance. The galvanostatic charge-discharge (GCD) test results reveal an impressive specific capacitance of 379.4 mF/cm2 at a current density of 1.5 mA/cm2, and with a capacitance retention rate of 87.1 %. In addition, the symmetric supercapacitor assembled using C/NiCo 2 O 4 electrode materials exhibits exceptional energy density and power density, reaching maximum values of 522.3 μWh/cm2 and 900 μW/cm2 respectively. The device is capable of illuminating LED for up to 8 min, further demonstrating its practical applicability. These results underscore the feasibility and promise of C/NiCo 2 O 4 as an electrode material for the advancement of high-performance supercapacitors. C/NiCo 2 O 4 -50/NF nanomaterials were prepared on nickel foam by electrochemical deposition and constant temperature heating treatment. The symmetric water system and solid-state supercapacitors were assembled with them, and the devices can light up LED lamps. [Display omitted] • Amorphous C was compounded on the surface of NiCo 2 O 4 using thermostatic heating treatment. • Amorphous C composite improves electrode material properties. • Symmetric supercapacitors assembled with C/NiCo 2 O 4 -50/NF have good performance and can light LEDs. [ABSTRACT FROM AUTHOR]