C@MnO2复合物的制备及其电化学性能

摘要

采用水热法,通过控制KMnO C/Mn比例对比电容的影响.结果表明,在0.5 mol/L Na流密度下恒流充放电400次,容量衰减不到4％,循环稳定性良好.简要分析了复合材料电极过程中双电层电容和赝电容对总电极容量的贡献.4浓度,制备出不同C/Mn比例的球体复合材料,应用于超级电容器,探讨不同2 SO4电解液中,CSM-3最高比电容可达216 F/g,1 A/g电流密度下恒流充放电400次,容量衰减不到4％,循环稳定性良好.简要分析了复合材料电极过程中双电层电容和赝电容对总电极容量的贡献.%Powdery carbon@ MnO 2 hybrid spheres for supercapacitor electrode materials have been synthe-sized in a hydrothermal method. The influence of C / Mn ratio on the specific capacitance has been investi-gated. Electrochemical tests showed that the composite materias exhibited excellent electrochemical prop-erties. The highest specific capacitance of CSM-3 can reach up to 216 F/ g. What's more,MnO 2 shells ex-hibited a good cycle ability with more than 96％ retention after 400 cycles at the current density of 1 A/ g. Besides,the respective contribution to the total capacitance of EDLCs and pseudocapacitance was briefly analyzed in the process of electrochemical reaction.