不同方法制备石墨类复合材料及其电化学性能

Preparation of graphite composite materials by different methods and their electrochemical performance

以氧化石墨烯(GO)、石墨相氮化碳(g-C3N4)为前驱体,分别采用水热法、微波法、煅烧法制备石墨烯(RGO)/g-C3N4复合材料。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶转换红外光谱(FT-IR)和热重(TG)等测试手段表征材料的表面微观结构和还原程度,采用循环伏安(CV)、恒流充放电(GCD)及电化学交流阻抗(EIS)测试复合材料的电化学性能。结果表明:以煅烧法制备的复合材料,结晶度较高,孔结构分布均匀,复合材料循环稳定性较好,当电流密度为0.2 A/g时,电极材料的比电容为724.53 F/g,显现出良好的电化学性能。

Graphene(RGO)/g-C3N4 composites were prepared by hydrothermal method,microwave method and calcination method using graphene oxide(GO)and graphite phase carbon nitride(g-C3N4)as precursors.The surface microstructure and degree of reduction of the material were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and thermogravimetry(TG).The electrochemical properties of the composite were tested by cyclic voltammetry(CV),galvanostatic charge/discharge(GCD)and electrochemical impedance spectroscopy(EIS).The results show that the composites prepared by calcination method have higher crystallinity,uniform pore structure distribution and good cycle stability,when the current density is 0.2 A/g,and the specific capacitance of the electrode material is 724.53 F/g,which shows good electrochemical performance.