Novel fabrication of a nanostructured NiCo2S4/Ni/Ni9S8 composite for energy storage applications

Abstract

Superior electrochemical behavior for nickel-cobalt sulfide electrodes must be researched and improved. For the storage of energy in supercapacitors, this work, the NiCo 2 S 4 /Ni/Ni 9 S 8 nanostructure composite (NCS/N/NS) was created using a solvothermal technique using PEI as a carbon source, followed by argon atmosphere annealing at 500 °C for an hour, followed by a hydrothermal method using thiourea as a sulfur and nitrogen source. NCS/N/NS supplies exceptional electrochemical energy storage features. When used for SCs, the manufactured electrode material, NCS/N/NS, revealed at 1 Ag −1 a superb capacitance of 1620 Fg −1 (696 Cg −1 ). An NCS/N/NS//activated carbon (AC) asymmetric device was created for practical use by utilizing an NCS/N/NS as the positively charged electrode and the opposite electrode of commercial AC. The asymmetric device achieved a unique specific energy of 53 Wh kg −1 , with a specific power of 887 W kg −1 at 1 Ag −1 .