球形多孔氧化钴/碳复合材料的制备及电容性能研究

采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Co3O4/C复合材料为5μm大小,孔径约为30nm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143F/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%.

Preparation and Capacitive Properties of Spherical Porous Co_3O_4/C Composite Material

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 N2 sorption measurements.Structure characterizations showed that high crystalline Co3O4/C composite material had average size of 5μm and pore size in the range of 30 nm.The electrochemical capacitive properties of Co3O4/C in 6mol/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 143F/g at a current density of 1A/g.The capacity retention was 77.8% after 1000 cycles at a current density of 1A/g.