Electrochemical performance of potentio-dynamically deposited Co3O4 electrodes: influence of annealing temperature
Co3O4 thin films were deposited potentiodynamically on to the stainless steel substrate. Prepared samples were annealed within the temperature range 473 K to 873 K by the interval of 100 K. XRD study reveals cubic crystal structure of Co3O4. FE-SEM showed compact agglomerated granular type morphology. Electrochemical characterization of electrodes showed pseudo capacitive behavior. Maximum value of specific capacitance (441.17 F/g) was achieved at the scan rate 2 mV/s in 1 M KOH with 87.88% stability. Charge–discharge curves showed nonlinear behavior and used to calculate the specific energy, specific power and columbic efficiency which were 20.98 W/kg, 15.96 kW/kg and 86.63% respectively. EIS of complex impedance spectra showed internal resistance ~0.9435 Ω.
KeywordsCo3O4 Cobalt Oxide Cobalt Hydroxide Supercapacitive Performance Columbic Efficiency
Authors are grateful to thanks Bhabha Atomic Research Center (BARC), Mumbai for providing financial support through the project scheme 2010/34/46/BRNS/2228 and to Department of Science and Technology New Delhi for providing financial support through the project scheme DST-SERB, SB/EMEQ-331/2013.
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