王伟，邢瑞光，张邦文*
（内蒙古科技大学 材料与冶金学院，内蒙古 包头 014010)
关 键 词：三维还原氧化石墨烯；二氧化锰；水热法；电化学性能；超级电容器
中图分类号：TD926.4 文献标识码：A
摘要：本文以VC为还原剂，从氧化石墨烯（GO）获得了三维结构的还原氧化石墨烯（3D-rGO），之后与KMnO4反应制备了3D-rGO/MnO2复合材料，直接作为超级电容器用无添加剂的电极。采用XRD、FTIR、XPS、SEM和TEM等手段对材料进行了表征，通过循环伏安、交流阻抗和恒流充放电等曲线，测试了复合电极在1M H2SO4中的电化学性能。结果显示：在1A/g电流密度的下，3D-rGO/MnO2的比电容可达308 F/g，远高于3D-rGO，经过500次循环后，电容保持率达到96%。
Synthesis and Electrochemical Properties of 3D-reduced Graphene Oxide supported MnO2 Composite Electrode Materials
Wei Wang, Ruiguang Xing, Bangwen Zhang*
(Material and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, China)
Key words: 3D-reduced graphene oxide; Manganese dioxide; Hydrothermal; Electrochemical properties; supercapacitor
Abstract: 3D-rGO was prepared by VC reduction of graphene oxide, and then the 3D-rGO supported MnO2 composite was prepared by reaction with KMnO4 at room temperature. By controlling the reaction time, the amount of MnO2 in the composite materials and its electrochemical properties were controlled. The morphology and microstructure of the nanocomposites were characterized by X-ray diffraction (XRD) analysis, X-ray Photoelectron Spectroscopy(XPS), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscope(TEM), scanning electron microscope(SEM) and field emission scanning electron microscope (FESEM). In addition, the electrochemical properties of free binder and free standing of the composite were investigated by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy techniques. The results indicate that in the optimal case, a specific capacitance of 308F/g can be obtained in 1M H2SO4 at a scan current density of 1A/g, with a capacitance retention of 90.2 % after 500 cycles.