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Title: Optimizations of preparative parameters in potentiodynamic synthesis of cobalt oxide thin films: Capacitive approach
Authors: Khavale, S V
Lokhande, B J
Keywords: Potentiodynamic electrodeposition;Cobalt oxide;Supercapacitor electrode;Cyclic voltammogram;Impedance
Issue Date: Mar-2019
Publisher: NISCAIR-CSIR, India
Abstract: The present article reports synthesis of Co3O4 thin films by facile potentiodynamic-electrodeposition technique using variations in the preparative parameters such as ingredient, solution concentration and deposition time. The prepared samples were analysed using XRD, FE-SEM, TEM, cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy. Crystallographic study shows polycrystalline face centered cubic spinel structure of the deposit. Cyclic voltammogram reveals pseudocapacitive behavior. The calculated highest value of specific capacitance at the scan rate 5 mV/s was 237.68 F/gin 1 M KOH, within the potential window -0.92 to 0.45 V versus Ag/AgCl. The calculated maximum value of specific energy, specific power and columbic efficiency from chronopotentiometry were 4.91 Wh/kg, 28.69 kW/kg and 94.78%, respectively. The internal resistance observed using electrochemical impedance spectroscopy was~ 3.55 Ω.
Page(s): 166-174
ISSN: 0975-0959 (Online); 0301-1208 (Print)
Appears in Collections:IJPAP Vol.57(03) [March 2019]

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