材料科学
石墨烯
超级电容器
介电谱
锰
复合数
氧化物
循环伏安法
电极
炭黑
电化学
碳纳米管
碳纤维
化学工程
过渡金属
电容
无机化学
纳米技术
复合材料
化学
冶金
有机化学
催化作用
工程类
物理化学
天然橡胶
出处
期刊:Carbon
[Elsevier]
日期:2012-09-04
卷期号:52: 1-9
被引量:65
标识
DOI:10.1016/j.carbon.2012.08.063
摘要
Manganese dioxide (MnO2) clusters were directly grown on different carbons, including reduced graphene oxide (RGO), multi-wall carbon nanotubes (CNTs), and carbon black (Vulcan XC-72), via a chelation-mediated aqueous solution method. The electrocapacitive properties of the composite materials were evaluated by using cycle voltammetry, electrochemical impedance spectroscopy (EIS), and charge/discharge techniques. The composite electrode consisting of RGO and MnO2 performed the best among the composite electrodes studied with a specific capacitance as high as 260 F/g at a current density of 0.3 A/g. EIS data revealed the smallest charge transfer resistance in electrode. The results suggest that two-dimensional (2D) RGO sheets are an excellent support for pseudocapacitive MnO2. This study provides fundamental insights into the role of a carbon support in carbon–transition-metal-oxide composite electrodes for supercapacitors.
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