Capacitive Study of Nickel Oxide Thin Films Prepared by Spray Pyrolysis

Abstract

Spray pyrolysis is a versatile method used for the deposition of nickel oxide thin films. In the present work, we report spray pyrolytic deposition of nickel oxide thin films on the conducting stainless steel substrates for the application in supercapacitor using 0.5 M, 50 ml solution of nickel nitrate at 673 K. X-ray diffraction patterns confirms simple cubic crystal structure with polycrystalline nature of the deposited samples. Sample exhibits hydrophilic nature as confirmed from the wettability study. The capacitive characteristics of the deposited films are investigated in 1 M KOH electrolyte using cyclic voltammetry. The supercapacitive properties of NiO are strongly affected by the scan rate. The maximum specific capacitance obtained is 62 F/g at 2 mV/s scan rate.