Effect of morphology on the electrochemical performance of NiO thin films

In this study, an electrochemical technique was used to deposit nickel oxide on stainless steel (SS) substrates with varying amounts of the precursor nickel nitrate (N1-0.5M, N2-1M and N3-1.5M), and nickel hydroxides Ni(OH)₂ are electrodeposited on the SS substrate. After that, they were subjected to heat treatment to become a homogeneous nickel oxide nanoparticle layer. The deposited films were performed for the structural and morphological analysis by X-ray diffraction, scanning electron microscopy and FTIR. The maximized N3 film exhibited the highest specific capacitance value of 514 F g⁻¹ at 5 mV s⁻¹ in 1 M KOH aqueous electrolyte with great rate capability, resulting in prolonged cycling.