Preparation and performance of MnO2/graphene composite electrode materials
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摘要: 以葡萄糖为还原剂，天然石墨片为原料，采用Hummer法制备了石墨烯粉末（Graphene）；并以该产物、KMnO4和HCl为原料，采用水热法制备了MnO2/Graphene复合材料。用扫描电子显微镜和X射线衍射对所制备的复合材料进行了表征，结果表明，水热法制备的MnO2材料为纯的-MnO2相，且石墨烯粉末的加入并没有影响MnO2的晶体结构。在1 mol/L Na2SO4电解液中进行了循环伏安和计时电位扫描测试，电极材料电化学性能稳定，具有较好的可逆性，在1.27 mA/cm2电流密度下进行充放电测试时，电极比电容为147.9 F/g；再循环1000次后，电极仍能保持稳定的电容，是一种理想的电化学电极材料。Abstract: In this paper, graphene is synthesized from natural graphite by a modified Hummers method and glucose is added as reducing agent. Hydrothermal method is used to prepare MnO2/graphene composite using KMnO4 and HCl as raw materials. The structure is characterized by SEM and XRD. The result shows that MnO2 prepared by hydrothermal method is pure -MnO2, and the addition of graphene powder doesnt influence its crystal structure. Electrochemical characterization is performed using cyclic voltammetry and chronopotentiometry in 1 mol/L Na2SO4 aqueous solution electrolyte. The electrode has a stable electrochemistry performance, and preferable reversibility, the specific capacitance of MnO2/graphene electrode is 147.9 F/g under 1.27 mA/cm2 current densities. The electrode presents a stable capacitiance after 1000 cycles and it is an ideal electrochemical material.
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Key words:
- graphene /
- MnO2 /
- supercapacitor /
- specific capacitance
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