Co_3O_4纳米片/碳微球复合物的制备及其超级电容器性能研究

Synthesis of Co_3O_4 nanosheet/carbon microsphere composite and its supercapacitor property

利用简单的低温水热法和后续高温煅烧,将Co_3O_4纳米片成功的生长在碳微球表面。X-射线衍射(XRD)和场发射扫描电镜(FE-SEM)测试表明,Co_3O_4纳米片自组装呈疏松状包覆于碳微球表面,纳米片之间相互交织形成三维多孔结构,丰富的孔道极有利于电解质离子在电极材料活性物质中的迁移和渗透。将其作为工作电极,表现出较高的电容性能,电流密度为1A/g时比电容达184F/g,当电流密度达5A/g时电容保持率为82.6%,电极材料具有良好的倍率特性。

Co3O4 nanosheets successfully grown on carbon microspheres by the hydrothermal method and the following annealing process. X-ray diffraction（ XRD） and field emission scanning electron microscopy（ FE-SEM） results revealed that Co3O4 nanosheets were interconnected to form hierarchical porous networks on carbon surfaces,which would facilitate electronic conduction in the electrode and ion transport in the electrode/electrolyte interface. As a supercpacitive electrode,the Co3O4 nanosheets/carbon microsphere composite achieved a higher specific capacitance of 184F/g at 1A/g and high rate capability（ 82. 6% retention at 5A/g）,which showed promise for application in future electrochemical energy storage.