Synthesis of Co2O4 Microspheres by Hydrothermal-Precipitation for Electrochemical Supercapacitors

Zhan Jun Yu; Ying Dai; Wen Chen

doi:10.4028/www.scientific.net/AMR.66.280

Paper Titles

Preparation of ZrC Powder by Self-Propagating High-Temperature Synthesis
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Preparation of Mg-Cu Composite by Tape Casting and Hot-Pressing
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Numerical Simulation of Dominating Control Factors of Thermal Protection FGM’s Effective Thermal Conductivity
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Spark Plasma Sintering Process of Fe-6.5%Si Alloy from Fe and FeSi Powders
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Study on Electrical Properties of Carbon Fiber Reinforced Cement Paste with CCCW
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The Effect of Surface Hydroxyl Groups on the Properties of SR/Al₂O₃ Composites
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Synthesis of Co₂O₄ Microspheres by Hydrothermal-Precipitation for Electrochemical Supercapacitors
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Preparation and Characterization of Novel Functional Gradient Syntactic Foam
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Effect of Sintering Schedule on the Microstructure of Carbon Nanotubes Reinforced Alumina Fabricated by SPS Method
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Synthesis of Co₂O₄ Microspheres by Hydrothermal-Precipitation for Electrochemical Supercapacitors

Abstract:

Co3O4 microspheres were synthesized by hydrothermal-precipitation method using NH3•H2O, H2O2, n-butanol and polyethylene glycol as precipitator, oxidant, assistant solvent and dispersant respectively. The products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the Co3O4 electrode were performed by cyclic voltammetry (CV) and galvanostaitc charge/discharge methods. The results exhibited that the Co3O4 single electrode had excellent stability, cyclic performance and high specific capacitance in KOH electrolyte. The specific capacitance as a single electrode was up to 653.74 F/g in the 6mol/L KOH solution with 0-0.4V potential at 2mA/cm2 current density. The effects of electrolyte concentrations and current densities on its capacitive performance were investigated. The Co3O4 prepared material is potential candidate for the preparation of power source devices.