摘要
以过硫酸钾（K2S2O8）和硫酸锰（MnSO4·H2o）为反应原料，采用液相沉淀法制备出纳米MnO2，通过X-射线衍射（XRD）和扫描电镜（SEM）对样品进行结构与形貌分析，结果表明，在pH=1、反应温度60℃条件下反应22h制备出的二氧化锰为纯四方晶系α-MnO2；循环伏安测试表明，二氧化锰在较小的扫描速度下离子运动速率较慢，电极材料中活性物质的利用率较高，充放电比较完全，电容性能较好，比容量较大；恒电流充放电测试表明，二氧化锰具有比较好的电化学电容特性，并且随着电流密度的增加，平均比电容逐渐减小。
Using MnSO4·H2O and K2S2O8 as raw materials, nanostructure Mn02 was synthesized by fluid phase method. The products were characterized by XRD, FTIR and SEM. The electrochemical properties of the samples were investigat- ed by cyclic voltammetry,impedance and current charge/discharge measurements.The results showed that under the con- dition pH=l,temperature T=60℃ and reaction time t=22h, the pure nanostructurea-MnO2 of system can be synthesized. In cyclic voltammetric tests, the results showed that Manganese dioxide in smaller scanning speed conditions have better capacitance performance. The constant current charging and discharging experiments showed that the manganese dioxide has good capacitance characteristics.
基金
贵州大学青年自然科学基金项目（[2009]064）
关键词
液相法
纳米MNO2
电化学性能
fluid phase method
nanostructure manganese dioxide
electrochemical properties
