Different electrodeposition techniques of manganese and nickel oxide on nickel foam and their effect on improved supercapacitor behaviour: a comparative study

Artikel i vetenskaplig tidskrift, 2023

Manganese and Nickel oxides were electrodeposited onto Nickel foam by potentiodynamic (10, 25 and 50 cycles), potentiostatic and galvanostatic modes and the effects of different electrodeposition techniques on the elemental compositions and their supercapactive behaviour were studied to optimise the most appropriate electrodeposition technique for supercapacitor application. The structural properties, morphology and elemental analysis were studied by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) accompanied by Energy-Dispersive X-Ray Analysis (EDX). The electrodes’ functional groups were analysed via Fourier Transform-Infrared Spectroscopy (FT-IR). Their electrochemical supercapactive performance were assessed by calculating the areal capacitance from cyclic voltammograms (CV), from Galvanostatic charge-discharge Curves (GCD), and their behaviour was accessed by Electrochemical impedance spectroscopy (EIS) analyses in 0.1 M KOH. The electrochemical results specified among the different electrode MN10, MN25, MN50 (potentiodynamic electrodeposition), MNCA (electrodeposition via chronoamperometry) and MNCP (electrodeposition via chronopotentiometry); MN25 delivered the highest areal capacitance areal capacitance 256.08 F cm−2, with energy density 12.81 Wh cm−2 and power density 150.71 W cm−2 with the capacitance retention percentage of 80.5% at 5 Acm−2 after 5000 cycles.