超级电容器电极材料二氧化锰的合成和性能研究  

Research on synthesis and properties of manganese dioxide supercapacitor electrode material

作　　者：刘洋[1] 艾常春[1] 胡意[1] 张强[1] 张睿[1] 田琦峰[1] 

机构地区：[1]武汉工程大学化工与制药学院化学工业研究设计院,湖北武汉430073

出　　处：《无机盐工业》2014年第3期71-74,78,共5页Inorganic Chemicals Industry

摘　　要：高锰酸钾和硫酸锰混合液,在高压反应釜内通过不同的水热时间合成了纳米级α-二氧化锰.借助X射线衍射（XRD）、扫描电镜（SEM）和比表面积（BET法）分析手段,对样品的结构和性能进行了表征.研究结果表明：水热时间为9h的样品,扫描电镜检测结果显示,合成的粉体是纳米粉体,粒径为50～60 nm;X射线衍射检测结果表明,合成的粉体为α-二氧化锰;合成粉体的比表面积达到53.66 m2/g.以该二氧化锰为工作电极、饱和甘汞电极（SCE）为参比电极、铂丝电极为辅助电极的三电极体系中,以1mol/L的硫酸钠溶液为电解液,通过循环伏安和计时电位法研究电化学行为,结果表明：在电位窗口为0～0.8 V（相对于饱和甘汞电极）、扫描速度为2mV/s时,其比电容达到76 F/g,循环伏安曲线接近于矩形.Nanoscale α-MnO2 was synthesized with potassium permanganate and manganese sulfate mixture in an autoclave at different hydrothermal times.The structure and properties of the samples were characterized by XRD,SEM,and BET analysis methods.Results showed that when the hydrothermal time was 9 h, SEM test showed that the synthesized powders was nanopowder with the particle size at 50-60 nm;XRD analysis showed that the powder was α-MnO2;and the specific surface area of BET test reached 53.66 m2/g.In the three electrode systems of manganese dioxide as the working electrode, a saturated calomel electrode （SCE） as the reference electrode, a platinum wire electrode as auxiliary electrode and using 1 mol/L Na2SO4 solution as electrolyte,the electrochemical behavior was studied by cyclic voltammetry and chronopotentiometry methods.Experimental results showed that when the potential window within the scale of 0-0,8V （vs.SCE）, and the scanning speed was 2 mV/s, its specific capacitance reached 76 F/g, and cyclic vohammetry curve was close to a rectangle.

关 键 词：超级电容器 电极材料 二氧化锰 

分 类 号：TQ137.12[化学工程—无机化工]