Synthesis and characterization of Co3O4 prepared from atmospheric pressure acid leach liquors of nickel laterite ores |
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Authors: | Long Meng Zhan-cheng Guo Jing-kui Qu Tao Qi Qiang Guo Gui-hua Hou Peng-yu Dong Xin-guo Xi |
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Affiliation: | 1.National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering,Chinese Academy of Sciences,Beijing,China;2.State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing,China;3.Key Laboratory of Green Process and Engineering, Institute of Process Engineering,Chinese Academy of Sciences,Beijing,China;4.Zhengzhou Institute of Emerging Technology Industries,Zhengzhou,China;5.Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province,Yancheng Institute of Technology,Yancheng,China;6.Jiangsu Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments,Yancheng Institute of Technology,Yancheng,China |
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Abstract: | A chemical precipitation-thermal decomposition method was developed to synthesize Co3O4 nanoparticles using cobalt liquor obtained from the atmospheric pressure acid leaching process of nickel laterite ores. The effects of the precursor reaction temperature, the concentration of Co2+, and the calcination temperature on the specific surface area, morphology, and the electrochemical behavior of the ob-tained Co3O4 particles were investigated. The precursor basic cobaltous carbonate and cobaltosic oxide products were characterized and ana-lyzed by Fourier transform infrared spectroscopy, thermogravimetric differential thermal analysis, X-ray diffraction, field-emission scanning electron microscopy, specific surface area analysis, and electrochemical analysis. The results indicate that the specific surface area of the Co3O4particles with a diameter of 30 nm, which were obtained under the optimum conditions of a precursor reaction temperature of 30°C, 0.25 mol/L Co2+, and a calcination temperature of 350°C, was 48.89 m2/g. Electrodes fabricated using Co3O4nanoparticles exhibited good electrochemical properties, with a specific capacitance of 216.3 F/g at a scan rate of 100 mV/s. |
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