氧化改性对超级电容器用中间相炭微球基多孔炭材料电化学性能的影响

Effects of oxidation modification on the electrochemical properties of MCMB-based mesoporous carbon materials for supercapacitors

利用碱活化法制备活性中间相炭微球(MCMBs),并以此具有多级孔结构、高比表面积的活性MCMBs为前驱体,采用硝酸氧化法在MCMBs表面引入含氧官能团。活性MCMBs和氧化后的MCMBs都有较高的比表面积,最大值可达到2102 m^2/g。分别以活性MCMBs和氧化后的MCMBs为超级电容器电极材料制备的水系双电层电容器循环性能良好,最大比电容可达248F/g,在相同电流密度下,氧化改性MCMBs的比电容高于活性MCMBs,表明表面含氧官能团能够提高MCMBs的超级电容器比电容。

Activated mesocarbon microbeads(MCMBs)were prepared by KOH activation.Oxygen-containing functional groups can be introduced on the surface of MCMBs with hierarchical pore structure and high specific surface area.Both activated MCMBs and oxidized MCMBs have a high specific surface area with a maximum of 2102 m^2/g.The specific capacitances of electric doublelayer capacitor(EDLC)prepared by activated MCMBs and oxidized MCMBs were measured,and the maximum value of specific capacitance was 248 F/g.At the same current density,the specific capacitance of the oxidized MCMBs was higher than that of activated MCMBs,which indicates that the surface oxidative modification for MCMBs could enhance the supercapacitor performance.