Synthesis and electrochemical properties of Co3O4 nanoparticles by hydrothermal method at different temperatures

4th International Conference on Advanced Composite Materials and Manufacturing Engineering 2017

材料科学;化学

Duan, Qiuyan^1,2 ; Chen, Haiyan^1

School of Material Science and Engineering, Shanghai Maritime University, Shanghai, China^1

Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, China^2

关键词: Annealing temperatures;    Aqueous electrolyte solutions;    Cyclic voltammograms;    Electrochemical supercapacitor;    Hydrothermal methods;    Hydrothermal temperature;    Nitrogen adsorption desorption;    X ray photoelectron spectrometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/207/1/012020/pdf
DOI  :  10.1088/1757-899X/207/1/012020

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this work, Co3O4nanoparticles were synthesized by hydrothermal method at different temperatures. The synthesized Co3O4nanoparticles were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS) and nitrogen adsorption-desorption. The Co3O4nanoparticles prepared at the hydrothermal temperature of 140 °C and at the annealing temperature of 350 °C have a shorter crystal spacing distance associated to the (220) crystal planes, larger BET surface area and more bivalent cobalt on the surface than these of Co3O4nanoparticles prepared at higher hydrothermal temperature or higher annealing temperature. The supercapacitor performances of synthesized Co3O4nanoparticles were analysed by cyclic voltammograms (CVs), Galvano static charge/discharge (GCD) and the electrochemical impedance spectroscopy (EIS) in 6 M KOH aqueous electrolyte solution. The Co3O4nanoparticles produced at lower temperatures exhibit good pseudo capacitance behaviour. Also, owning to the low hydrothermal temperature and the annealing temperature of Co3O4nanoparticles, they can be relatively low cost in favour of a promising candidate for electrochemical supercapacitors.