MnO_2/石墨烯复合材料的制备及其电化学性能研究

Preparation and Electrochemical Properties of MnO_2/Graphene Composites

我们以KMnO_4和石墨烯为原料,通过微波法、水热法和乙醇还原法制备了MnO_2/石墨烯复合材料,利用高分辨扫描电子显微镜(SEM)对样品的微观形貌进行了表征分析,并将所得复合材料制备成电极片,组装成超级电容器,采用恒电流充放电(GCD)、循环伏安(CV)、交流阻抗(EIS)在两电极体系下对电极材料进行电化学性能测试。实验结果表明,乙醇还原法所制得复合材料的微观形貌最好,其质量比电容最大可达180.54 F/g。

In this paper, using KMnO_4 and graphene as raw materials, MnO_2/graphene composites was prepared by microwave method, hydrothermal method and ethanol reduction method, respectively. Their morphologies and phase structures were characterized by high resolution scanning electron microscopy（SEM）. Then the composite materials were prepared into electrode sheets, and the electrode sheets were assembled into a symmetric supercapacitor. Then constant-current charge and discharge（GCD）, cyclic voltammetry（CV） and impedance spectroscopy（EIS） methods were used to test their electrochemical properties under the two-electrode system. The results show that the morphologies and phase structures of composite prepared by ethanol reduction method was best, and the capacitance was up to 180.54 F/g.