Chemical Synthesis and Characterization of Nickel Sulphide Thin Film Electrode for Supercapacitor Performances

Abstract

All Nickel Sulphide thin films were deposited onto the stainless steel substrate by modified chemical bath deposition method. The structural, surface morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) respectively. The electrochemical capacitor performances were examined by using cyclic voltammetry and galvanostatic charge-discharge method. The NiS electrode exhibits a good cycling performance. The specific capacitance of 353 Fgm -1 has been obtained in 2 M KOH solution at a scan rate 50 mVs -1 within the potential range 0 to 0.8 V Vs Ag/AgCl. In charge-discharge behaviors, the maximum energy density (E) of 11.7 Whkg -1 and power density (P) of 4.3 kWkg -1 was obtained at a current density 1 mA/cm 2 . Impedance spectroscopic analysis revealed that the ESR is 5 Ω in KOH electrolyte. Keywords— Nickel Sulphide (NiS), Thin films, Cyclic voltammetry, Supercapacitor, Charge-discharge