Preparation and electrochemical performance of NiCo₂S₄ nanoelectrode materials

Abstract

In this paper, NiCo₂S₄ nanoelectrode materials were prepared by a two-step hydrothermal method. Physical and morphological characterization and electrochemical testing revealed that the prepared NiCo₂S₄ has a sea urchin-like layered three-dimensional network structure, which can fully increase the contact area with the electrolyte, increase the active sites and improve the electrochemical performance. The specific capacitance of the prepared NiCo₂S₄ nanomaterials reached 717.32 F/g. The cyclic voltammetry test curve as well as galvanostatic charge-discharge (GCD) test curve have perfect symmetry, good material reversibility. Electrochemical impedance spectroscopy (EIS) indicates materials with low impedance. The specific capacitance remained 76.8% after 3000 cycles and the electrochemical stability was good. NiCo₂S₄ electrode material has excellent electrochemical properties and has a promising application in supercapacitor electrodes.

Keywords:

• NiCo₂S₄
• supercapacitor
• electrode material
• transition metal sulfide
• electrochemical performance

Additional information

Funding

This work was supported by Scientific Research Project of Education Department of Hubei Province (D20203101).