强激光与粒子束, 2014, 26 (11): 114102, 网络出版: 2014-12-08  

MnO2/石墨烯复合电极材料的制备与储能性能

Preparation and performance of MnO2/graphene composite electrode materials
作者单位
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
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 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 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.

袁磊, 付志兵, 常丽娟, 杨曦, 张厚琼, 王朝阳, 唐永建. MnO2/石墨烯复合电极材料的制备与储能性能[J]. 强激光与粒子束, 2014, 26(11): 114102. Yuan Lei, Fu Zhibing, Chang Lijuan, Yang Xi, Zhang Houqiong, Wang Chaoyang, Tang Yongjian. Preparation and performance of MnO2/graphene composite electrode materials[J]. High Power Laser and Particle Beams, 2014, 26(11): 114102.

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