氧化锰的液相合成及其电容性能  

Liquid-phase Synthesis and Capacitance Properties of MnO_2

作　　者：俞兆喆[1] 徐华蕊[1] 颜东亮[1] 

机构地区：[1]桂林电子科技大学信息材料科学与工程系,桂林541004

出　　处：《材料导报》2010年第16期97-99,共3页Materials Reports

基　　金：教育部"新世纪优秀人才计划"专项资金(NCET-06-0758);广西区教育厅基金(200808MS165);广西区研究生创新项目基金(2009105950809M38)

摘　　要：将高锰酸钾分别与聚乙二醇、硫酸锰进行液相反应制备了超级电容器电极材料。借助XRD、SEM、恒流充放电测试和循环伏安测试等对电极材料的结构及电化学性能进行了表征。结果表明,两种反应的产物均为无定型,高锰酸钾与聚乙二醇反应产物的颗粒粒径较与硫酸锰反应产物的粒径小,平均粒径为100nm,且在-0.6～0.4V(vs.SCE)的电位窗口内以200mA/g的电流密度恒流充放电,测得单电极比容量达到550F/g,300周次循环后比容量保持在200F/g左右,是高锰酸钾与硫酸锰反应产物的2倍。Manganese dioxide as electrode material for supercapaeitor is synthesized by the chemical preclpitation method using potassium permanganate and polyethylene glycol or manganous sulfate aqueous solution as reactant, respectively. The structure and electrochemical properties of the as-prepared electrode material are characterized by XRD, SEM, cyclic voltammetry and galvanostatic charging discharging. The results show that all of the as-synthesized powder has amorphous structure and the particle size of powder from potassium permanganate and polyethylene glycol is 100nm, smaller than the one from potassium permanganate and manganous sulfate. Within the potential window range from-0. 6V to 0. 4V（vs. SCE）, the maximum specific capaeitance value is 550F/g at the 200mA/g through galvanostatic charging-discharging, and 200F/g after 300cycles, which is 2 times higher than the one from manganous sulfate.

关 键 词：氧化锰 超级电容器 恒流充放电 循环伏安 

分 类 号：O643.36[理学—物理化学]