MnO_2/石墨烯复合电极材料的制备与储能性能  

Preparation and performance of MnO_2/graphene composite electrode materials

作　　者：袁磊[1] 付志兵[1] 常丽娟[2] 杨曦[1] 张厚琼[1] 王朝阳[1] 唐永建[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]四川大学原子与分子物理研究所,成都610065

出　　处：《强激光与粒子束》2014年第11期210-215,共6页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目

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α-MnO2相,且石墨烯粉末的加入并没有影响MnO2的晶体结构。在1mol/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1.27mA/cm2电流密度下进行充放电测试时,电极比电容为147.9F/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。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 α-MnO2,and the addition of graphene powder doesn＇t influence its crystal structure.Electrochemical characterization is performed using cyclic voltammetry and chronopotentiometry in 1 mol/L Na2 SO4 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.

关 键 词：石墨烯 MNO2 超级电容器 比电容 

分 类 号：TQ177[化学工程—硅酸盐工业]