Synthesis and Characterization of Nanostructured Nickel Cobalt Sulfide/MWCNTs Composite Grown on Nickel Foam as Direct Electrode Material for Supercapacitor

Abstract

The synthesis of NiCo2S4 /MWCNTs composite on Ni foam and its applications were investigated. A hydrothermal method involving two steps is used in this work for the insitu decoration of NiCo2S4/MWCNTs composite on bare nickel foam. Nanostructures of NiCo2S4 are also synthesized via same route. The synthesized samples were characterized through versatile techniques such as XRD for structural and SEM for morphological studies. The electrochemical analysis of the materials is performed using CV and GVD tests. A typical three electrode method is used for the electrochemical measurement in a 2 M KOH electrolyte. The calculated areal capacitance at the current density of 3 mA cm-2 was 5.38 F cm-2 and mass specific capacitance was 2210 F g-1. As the current density is increased, the areal capacitance was decreased. The mixture of high electrical conductivity, open structure of MWCNTs and the nickel, cobalt played a noteworthy parts to get supercapacitor electrodes with exceptional performance. Cyclic stability test conducted revealed that new composite material has good electrochemical performance.