Co_3O_4/石墨烯复合物的水热合成及其超级电容器性能

Hydrothermal synthesis of Co_3O_4/graphene composite and its electrochemical performance as supercapacitor electrodes

采用水热法制备了Co3O4/石墨烯复合物,用XRD、FTIR和TEM测试了样品的结构和形貌,采用循环伏安法(CV)、交流阻抗和恒电流充放电测试分别研究了Co3O4/石墨烯复合物电极的电化学性能。结果表明:石墨烯的掺入增加了Co3O4作为电极材料的可逆性,并降低了Co3O4纳米粒子与电解液的接触电阻和Warburg扩散阻抗。在6mol/L的KOH电解液中,复合物的比电容高达562F/g,1000次循环后比电容仅仅下降了2.6%。

Co3O4/graphene composite was synthesized by one step hydrothermal method.The samples was tested by X-ray diffraction（XRD）,fourier transform infrared spectroscopy（FTIR） and transmission electron microscopy（TEM）.The electrochemical performance was tested by cyclic voltammetry（CV）,electrochemical impedance spectroscopy（EIS） and galvanostatic charge-discharge methods.The experimental results indicated that： graphene played an important role in increasing the accessible surface areas,Warburg impedance and the reversibility of the electrode material.The specific capacitance of the composite was up to 562F/g in 6 mol/L KOH electrolyte.Moreover,the specific capacitance decreased by only 2.6 % after 1000 cycles.