新型纳米结构二氧化锰的制备及其超级电容性能

摘要

以MnSO4和(NH4)2S2O8为主要原料,Fe(NO3)3为添加剂,采用水热法制备了菜花状MnO2.运用XRD,SEM对制备的MnO2进行了形貌和结构分析.通过循环伏安、恒流充放电测试和交流阻抗研究了MnO2的电化学性能.结果表明,实验制备的MnO2为α型菜花状结构,其在6 mol/L的KOH电解液中及0～0.4 V的电位范围内表现出良好的超级电容性能,电流密度为100 mA/g时,其比容量达到176 F/g.%Cauliflower MnO2 was prepared by hydrothermal synthesis method by reacting MnSO4 and (NH4)2S2O8 with Fe(NO3)3. The samples were analyzed by X-ray diffraction(XRD) and scanning electron microscopy (SEM). Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical performance of the samples. The results show that the prepared samples are α-MnO2. The particles are in a caulillower shape. In an electrolyte of 6 mol/L KOH , electrode based on the MnO2 show perfect supercapacitor characterization in the potential region of 0～0.4 V. At a current density of 100 mA/g , a specific capacitance of 176 F/g is achieved.