MnO_2/碳球复合材料的制备及其电化学性能的研究  

Preparation and electrochemical properties of MnO_2/carbon sphere composites

作　　者：邢冠楠[1] 刘云芳[1] 田艳红[1] 段红英[1] 迟伟东[1] 

机构地区：[1]北京化工大学材料科学与工程学院碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2014年第2期41-47,共7页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：中央高校基本科研业务费(505564)

摘　　要：利用碳球为还原剂,在中性KMnO4溶液中制备出MnO2/碳球复合材料,并对其结构和电化学性能进行了研究。结果显示,随着碳球含量的增加,MnO2/碳球复合材料的循环稳定性提高,但比电容量降低;当碳球质量分数为35%时,MnO2/碳球复合材料的比电容量在50 mA/g的电流密度下达到181 F/g。分别采用KOH活化和混酸氧化的碳球为还原剂,可以有效地提高MnO2/碳球复合材料的比电容量和循环稳定性,相应复合材料的比电容量分别达到192 F/g和218 F/g,而且经过500次的充放电测试,仍然保持为184 F/g和192 F/g。MnO2/carbon sphere composites(MnO2/CS composites) have been prepared in neutral KMnO4solution using CS as a reducing reagent.The structures and electrochemical properties of the composites were investigated.The results reveal that the cycling stability of MnO2/CS composites electrodes is improved with increasing CS content,while the specific capacitance decreases.The specific capacitance of a composite containing 35% mass fraction of CS was 181 F/g at a current density of 50 mA/g.The stability and capacitance of the composite electrodes were greatly improved by using KOH-activated or acid-oxidized CS;the corresponding specific capacitances of the composite electrodes were increased to 192 F/g and 218 F/g,respectively.Furthermore,the values remained as high as 184 F/g and 192 F/g respectively,after 500 times charge-discharge cycles.MnO2/CS composites containing pre-treated CS exhibit excellent capacitance characteristics as supercapacitor electrode materials.

关 键 词：碳球 MNO2 复合材料 超级电容器 电化学性能 

分 类 号：O613.71[理学—无机化学] TM53[理学—化学]