Synthesis and Electrochemical Performance of Co3O4/Graphene |
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Authors: | WANG Hongzhi SHI Yulei LI Zixuan ZHANG Weiguo YAO Suwei |
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Affiliation: | Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China |
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Abstract: | Co3O4/reduced graphene oxide composites were synthesized via a simple electrochemical method from graphene oxide and Co(NO3)2·6H2O as raw materials. Co3O4 nanoparticles with sizes of around 30-50 nm were distributed on the surface of graphene nanosheets confirmed by scanning electron microscopy and transmission electron microscopy. Electrochemical properties of Co3O4/graphene composite were tested by cyclic voltammetry, galvano- static charge-discharge, and electrochemical impedance spectroscopy. The Co3O4/reduced graphene oxide composite was used as the pseudocapacitor electrode in the 2 mol/L NaOH aqueous electrolyte solution. The Co3O4/reduced graphene oxide composite electrode exhibited a specific capacitance of 357 F/g at a current density of 0.5 A/g in a three-electrode system. 72% of capacitance was retained when the current density increased to 3 A/g. The Co3O4/reduced graphene oxide composite prepared electrodes show a high rate capability and excellent long-term stability. After 1000 cycles of charge and discharge, the capacitance is still maintained 87% at a current density of 1 A/g, indicating that the composite is a promising alternative electrode material used for supercapacitors. |
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Keywords: | Cobalt oxide Graphene Composite Electrochemical preparation Supercapacitor |
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