Hydrothermal process fabrication of NiO-NiCoO2-Co3O4 composites used as supercapacitor materials

作者：Wang, X. W.; Wang, X. E.; Liu, Y. P.; Kong, Y. Y.; Sun, L. Y.; Hu, Y. C.; Zhu, Q. Q.

来源：Journal of Materials Science: Materials in Electronics , 2017, 28(20): 14928-14934.

DOI：10.1007/s10854-017-7364-x

• HIGH-PERFORMANCE SUPERCAPACITOR
• ELECTROCHEMICAL ENERGY-STORAGE
• ELECTRODE MATERIALS
• ACTIVATED CARBON
• CO3O4 ELECTRODES
• FACILE SYNTHESIS
• NIO
• NANOPARTICLES
• TEMPERATURE
• CAPACITORS

A composite consisting of Co3O4, NiCoO2 and NiO is prepared by a simple and easy hydrothermal method followed by calcining at 300 degrees C. The composition, morphology and microstructure of NiO-NiCoO2-Co3O4 composites are examined by X-ray diffraction, field emission scanning electron microscope and transmission electron microscopic. The electrochemical performances of NiO-NiCoO2-Co3O4 composites are characterized by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy in 3 M KOH electrolyte. The results of electrochemical measurements show that the NiO-NiCoO2-Co3O4 composites exhibit a high specific capacitance of 990 and 580 F/g at the current densities of 1.0 and 10 A/g, respectively. About 50% of the maximum specific capacitance can still be retained after 1000 continuous CD cycles at 10 A/g. It reveals a great potential of NiO-NiCoO2-Co3O4 composites used in high-performance energy-storage systems.

• 出版日期2017-10
• 单位河南师范大学