球形多孔氧化钴/碳复合材料的制备及电容性能研究

Preparation and Capacitive Properties of Spherical Porous Co₃O₄/C Composite Material

摘要: 用水热合成和煅烧制备氧化钴/碳( Co₃O₄/C) 复合材料, 通过 SEM 、XRD 、N₂ 吸附实验等对该材料进行表征 . 制备的 Co3C₄ /C 复合材料为 5 μm 大小, 孔径约为 30 nm 的多孔球形结构 .在 6mol /L 的氢氧化钾溶液中进行电化学测试 . 结果表明, Co₃O₄/C 复合材料具有良好的电容性能 .在电流密度为 1A / g 时, 比电容为 143 F/g . 此外,Co₃O₄/C 复合材料还表现出良好的循环稳定性, 在 1A /g 的电流密度下, 充放电循环 1000次后, 比电容保持率为77.8%.

Abstract: The spherical porous cobalt oxide/carbon (Co3O4/C) composite material was prepared via hydrothermal synthesis and calcination. The structure of the as-synthesized Co3O4/C was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and N2 sorption measurements. Structure characterizations showed that high crystalline Co3O4/C composite material had average size of 5 μm and pore size in the range of 30 nm. The electrochemical capacitive properties of Co3O4/C in 6 mol/L KOH solution were investigated by cyclic voltammetry (CV), chronopotentiometry and electrochemical impedance spectroscopy (EIS) measurements. The results showed that Co3O4/C composite material had good capacitive performance with specific capacitance of 143 F/g at a current density of 1 A/g. The capacity retention was 77.8% after 1000 cycles at a current density of 1 A/g