基于阴离子还原剂制备的超级电容器用中孔MnO_2研究

Investigation of anion reducing agents prepared mesoporous MnO_2 for supercapacitors

以Na2S2O3为还原剂，KMnO4为氧化剂制备了超级电容器用MnO2，采用SEM、N2吸附-脱附和XRD对样品进行了分析。用循环伏安和恒流充放电测试对样品的电化学性能进行了表征。结果表明，实验制备的MnO2为无定型结构，呈类球状，直径为20～40nm，比表面积和平均孔径分别为182．6m^2／g和6．2nm。在1mol／L（NH4）2S04水溶液中，在-0．4～0．5V（VS．SCE）的电位范围内，MnO2具有典型的赝电容特性和高功率特性。在10mA／cm。的电流密度下，MnO2比容达到397F／g，且具有高循环效率。

Mesoporous MnO2 for supercapacitors was prepared by using Na2S2O3 as the reducing agents and KMnO4 as the oxidant. The samples were analyzed by scanning electron microscope （SEM）,N2 adsorption-desorption and X-ray diffraction （XRD）. Cyclic vohammetry and galvanostatic charge/discharge were used to characterize the electrochemical performance. The results showed that the as prepared nanomaterial was amorphous MnO2 with a diameter of 20-40nm. The specific surface area and mean pore diameter was 182.6m^2/g and 6.2nm, respectively. In an electrolyte of lmol/L （NH4）2SO4, the MnO2 had typical capacitive characterization and high power in the potential region of -0.4-0.5V（vs SCE）. At a current density of 10mA/cm^2 ,a specific capacitance of 397F/g was achieved. The Mesoporous MnO2 exhibited high cycling efficiency.