电解液对超级电容器Mn_3O_4电极材料性能的影响

Effect of Electrolyte on Performance of Mn_3O_4 Electrode Material for Supercapacitors

以应用于超级电容电极的锰氧化物材料为主要研究对象,用溶剂热法制备四氧化三锰(Mn3O4)电极材料,以X线衍射(XRD)和扫描电子显微镜(SEM)对材料性能进行了表征,采用循环伏安法、恒电流充放电法和电化学阻抗法对材料电性能进行了测试,分别以1 mol/L硫酸钠(Na2SO4)和6 mol/L氢氧化钾(KOH)为电解液研究了不同电解液对Mn3O4电极材料性能的影响.结果表明,当电流密度为0.5 A/g时,Mn3O4在KOH电解液中的比电容为48 F/g,相比在Na2SO4电解液中所得的比电容22 F/g要大.

Taking the manganese oxide applied to supercapacitor electrodes as the main object of study,the Mn3O4 electrode material was prepared by solvent-thermal method,the material performance was characterized by X-ray diffraction（ XRD） and scanning electron microscope（ SEM）,and electrochemical performances of Mn3O4 were studied by cyclic voltammetry,constant current charge-discharge method and AC impedance. Then,using 1mol / L Na2SO4 and 6 mol / L KOH as the electrolyte,the effect of electrolyte on performance of Mn3O4 electrode was studied. The result shows that the specific capacitance of Mn3O4 in KOH is 48 F / g,higher than 22 F / g in Na2SO4.