液相沉淀法制备的棒状α-MnO_2研究

The research of α- MnO_2prepared in liquid phase precipitation

采用硫酸锰和高锰酸钾为原料,用液相沉淀法制备α-MnO2,经XRD、SEM、差热热重、循环伏安和恒流充放电测表征分析.结果表明,硫酸锰和高锰酸钾在80℃的条件下,反应4h,得到分散均匀、棒径约10 ～20 nm的α-MnO2粉体,在1 mol/L的Na2SO4电解液中扫描速度为75 mV/s,表现出较好的循环特性,300 mA/g恒流充放电,比电容为112.6 F/g,阻抗为0.75 Ω.

In this paper ot - MnO2 was prepared by liquid phase precipitation with the manganese sulfate and potassium permanganate as raw materials. The morphologies and structures of prepared MnO2 were studied by scanning electron microscopy （SEM） and X - ray diffraction （XRD）, the results show that ：the rod diameter about 10 - 20 nm, dispersed evenly rod alpha MnO2 powder has been prepared by a reaction between manganese sulfate and potassium permanganate under the condition of 80 ℃ for 4 hours. The electrochemical properties are characterized by cyclic voltammeter and electrochemical impedance spectroscopy in a 1 m01/L Na2SO4 electrolyte. The specific capacitance value is 112.6 F/g, and the impedance is 0.75 Ω.