将氧化石墨烯GO ( Graphene oxide)进行热还原得到RGO( Reduced graphene oxide),通过液相法原位合成出RGO/MnO2电极复合材料。采用扫描电镜( SEM)、X射线衍射( XRD)、傅里叶红外( FT_IR)、四探针法和循环伏安测试表征分析复合材料的表面形貌、微观结构、电导率和比电容。结果表明,相较于纯MnO2和GO/MnO2电极材料,RGO/MnO2复合材料比电容得到提高。热还原温度为600℃时比电容最高,为321 F·g-1。这可能是GO的加入显著降低了MnO2的团聚程度,增大了MnO2参与赝电容反应的活性面积。热还原得到的RGO有效提高了复合材料的电导率,其残留的含氧官能团提供了一定的赝电容。
Thermally reduced graphene oxide ( RGO)/MnO2 composites were prepared by the thermal reduction of graphene ox_ide ( GO)/MnO2 composites. The structure, electrical conductivity and specific capacitance of the composites before and after ther_mal reduction were investigated by SEM, XRD, FT_IR,the four_pointprobe method and cyclic voltammetry. Results showed that the GO and RGO significantly decreased the agglomeration of MnO2 . The RGO/MnO2 composites had higher specific capacitances than pure MnO2 or GO/MnO2 composites. A RGO/MnO2 composite reduced at 600 ℃ had the highest specific capacitance of 321 F·g-1 and good stability upon cycling. The presence of an optimum reduction temperature could be accounted for by the fact that the ther_mal reduction decreased the amount of oxygen_containing functional groups that contribute to pseudocapacitance in GO and increased its electrical conductivity which favors a capacitance increase.
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