通过在不同温度下对KMnO4进行热分解制得电化学电容器电极材料MnO2.经XRD和TEM测试,结果表明不同温度得到的MnO2具有一定的层状结构,随着温度升高,无定形相/晶化相比降低.电化学测试表明这些材料皆有典型的电容性能. 550℃热解产物电容特性最好,比电容量达243F·g-1,充放电性能好,经200次循环电极容量保持在95％以上.
Manganese dioxides were prepared by direct thermal decomposition of KMnO4 at different temperatures. XRD
and TEM measurements show that the materials contain a large amorphous/crystalline ratio and have layered structures with K+ ions between them.
Cyclic voltammetry tests indicate that the materials prove to be excellent electrodes for electrochemical capacitors in a mild 0.5mol/L Na2SO4 aqueous electrolyte. A sample decomposed at 550℃ gives a specific
capacitance of 243F·g-1 between --0.2 and +1.0V(vs. SCE), and an excellent cyclability after 200 cycles at constant current 40mA and its specific capacitance
remains over 95%.
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