碱性纳米MnO_2/AC混合超级电容器

Nano-MnO_2/Activated Carbon Hybrid Supercapacitors Using Alkaline Electrolyte

采用低热固相反应法制备出纳米MnO2活性材料．循环伏安测试结果表明，在6mol·L^-1 KOH电解液中，MnO2电极在-0．3—0．6V（vs．Hg／HgO）的电压范围内表现出较好的超电容特性．恒流充放电结果表明，以MnO2为正极、活性炭（AC）为负极组成的碱性MnO2／AC混合电容器在比电流为100mA·g^-1、充放电电压范围为0，1．5V条件下的放电比电容可达66，2F·g^-1．同样条件下，MnO2与活性炭质量比为80：20的复合正极与活性炭负极组成的（MnO2＋AC）／AC混合电容器的比电容可达78．2F·g^-1．

A nano-structured manganese dioxide active material was synthesized in a low-temperature solid reaction. Cyclic vohammetry result shows that the MnO2 electrode presents ultra-capacitance property in 6 mol·L^-1 KOH electrolyte in the electrode potential range of - 0.3 to 0.6 V （vs. Hg/HgO）. Galvanostatic charge-discharge results indicate that the MnO2/activated carbon （AC） single hybrid capacitor can provide specific capacitance of 66.2 F·g^-1 in the operating voltage range of 0 to 1.5 V at a specific current of 100 mA·g^-1. Under the same conditions, specific capacitance of （MnO2 ＋ AC）/AC hybrid capacitor can reach 78.2 F·g^-1, where the composite positive electrode is composed of 80% MnO2 and 20% activated carbon.