水热合成法制备超级电容器用二氧化锰薄膜电极  

Hydrothermally Synthesized Manganese Dioxide Film as Supercapacitor Electrode

作　　者：苏小辉[1] 余林[1] 程高[1] 张环华[1] 

机构地区：[1]广东工业大学轻工化工学院,广州510006

出　　处：《材料导报》2015年第10期18-21,共4页Materials Reports

摘　　要：采用简单的水热合成法制备了基于石墨基底的多孔α-MnO2薄膜电极。用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)、BET氮气吸附法和热重分析(TG)对产物进行表征,结果表明,沉积得到了由纳米棒交织而成的网络结构的α-MnO2薄膜。用循环伏安法和恒流充放电法对其电化学性能进行研究,结果显示,在1mol·L-1Na2SO4溶液中,电流密度为1A·g-1时,α-MnO2薄膜的比电容可达到229F·g-1,该电极材料在2A·g-1的电流密度下进行2000次循环,电极容量的衰减仅为2%。Manganese dioxide film was deposited onto a graphite substrate by a simple hydrothermal method. The film was characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, X-ray energy disper- sive spectroscopy （EDS）, BET nitrogen adsorption and thermogravimetry （TG）. The results showed that α-MnO2 de- posited homogeneously on the graphite substrate with nanorod structures. Electrochemical properties of the film were studied by cyclic voltammetry （CV） and galvanostatic charge/discharge （IN3） methods in 1.0 mol·L-1 Na2 SO4 solu- tion. The film exhibited good rate capability and excellent cycling stability with only 2% capacitance loss after 2000 cycles at the current density of 2 A·g-1, and the specific capacitance （SC value was 229 F·g 1 at the current den- sity of 1 A ·g-1.

关 键 词：超级电容器 二氧化锰 电化学性能 水热合成 

分 类 号：O646[理学—物理化学]