超级电容器用纳米MnO_2的阴离子还原剂制备研究

Investigation of Anion Reducing Agents Prepared Nanosized MnO_2 for Supercapacitors

以KMnO2为氧化剂，以NaHSO2为阴离子还原剂制备了超级电容器用MnO2运用N2吸附、SEM和XRD对氧化锰进行r形貌和结构表征。通过循环伏安和恒流充放电测试研究了氧化锰的电化学性能。结果表明：实验制备的MnO2为无定型结构．粒径为20～40nm．比表面积为155．4m2·g-1在1mol·L-1的（NH4）2SO4溶液中，在0．4～0．5V（VSSCE）的电位范围内表现出典型的法拉第髓电容行为，电流密度为10mA·cm-1时，其比容达到325F·g-1。

MnO2 was prepared by using KMnO4 as the oxidant and NaHSO3 as the reducing agent. The samples were analyzed by Neadsorption, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. Cyclic voltammetry and galvanostatic charge/discharge were used to characterize the electrochemical performance of the samples. The results showed the as prepared MnO2 is amorphous with a diameter of 20 to 40nmand a BET specific surface area of 155.4m2 ·g-1 In an electrolyte of lmol L-1 （NH4）2SO4, the nanosized MnO2 had typical capacitive characterization in the potential region of -0.4 0.5V（vs. SCE）. At a current density of 10mA · cm-2, the MnO2 had a specific capacitance of 325F· g-1.