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采用超声-浸渍法,以SBA-15为硬模板、Mn(NO3)2为锰源制备出介孔MnO2.采用X射线衍射(XRD)、扫描电镜(SEM)、氮气吸附-脱附以及热重-差热方法(TG/DTA)对样品的物理结构进行表征;用恒流充放电、循环伏安和电化学阻抗(EIS)考察样品作为超级电容器电极材料的性能.结果表明,样品MnO2复制了SBA-15的介孔结构,比表面积、平均孔径分别为282m2.g-1和2.75nm;介孔MnO2作为超级电容器电极材料,具有良好的动力学可逆性,电荷转移电阻小,电化学活性较高,首次放电比容量为285F.g-1,循环500次后仍保持在210F.g-1.
The mesoporous MnO2 was prepared by ultrasonic-impregnation method with SBA-15 as hard template and Mn (NO3) 2 as manganese source. X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption and thermogravimetric analysis - Differential thermal analysis (TG / DTA) was used to characterize the physical structure of the samples. The properties of the samples as supercapacitor electrode materials were investigated by constant current charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy (EIS) The mesoporous structure, specific surface area and average pore size of SBA-15 are 282m2.g-1 and 2.75nm, respectively. Mesoporous MnO2 has good kinetic reversibility, small charge transfer resistance and electrochemical activity as electrode material of supercapacitor High, the first discharge capacity of 285F.g-1, after 500 cycles remained at 210F.g-1.