活性炭/二氧化锰纳米复合材料的合成及超级电容性能  

Synthesis and supercapacitor performance of activated carbon/MnO_2 composites

作　　者：王福华[1] 茆志友 姚秋实[1] 吴翠[1] 高云芳[1] 

机构地区：[1]浙江工业大学化学工程学院绿色化学合成技术国家重点实验室培育基地,浙江杭州310014

出　　处：《应用化工》2015年第5期785-788,793,共5页Applied Chemical Industry

基　　金：国家科技支撑计划(2104BAC03B03)

摘　　要：以商业活性炭为载体,通过硝酸表面改性活性炭,引入含氧官能团,为棒状二氧化锰（MnO2）和活性炭的结合提供桥梁。采用化学沉淀法在炭表面反应生成纳米结构的棒状二氧化锰,制备二氧化锰/改性活性炭（MnO2/OAC）复合电极材料。采用扫描电镜（SEM）、X射线衍射（XRD）对其结构进行表征;采用循环伏安法、恒流充放电对其电化学性能进行研究。结果表明,生成的MnO2均匀地负载在碳的表面,颗粒的直径在20~50nm;在1mol/L的Na2SO4电解液中,MnO2/OAC6复合电极材料体现了极佳的比电容,达到369.7F/g。材料优异的电化学性能归功于活性炭发达的孔隙结构和MnO2提供的法拉第电容。Activated carbon was modified by nitric acid to create oxygen-containing functional groups in order to provide anchor sites between the activated carbon and manganese dioxide （ MnO2 ） nanorods. MnO2 nanorods were synthesized in the surface of activated carbon using a fluid phase method. Themor- phology and structure of MnO2/oxidized activated carbon （MnOJOAC） were characterized using SEM, XRD and the electrochemical behavior was investigated using cyclic voltammetry （ CV）, charge-discharge tests,and cycle life tests. The results showed that the MnO2 nanorods in the composite were dispersed homogeneously on the nitric acid treated activated carbon surface with the particles diameter of 20 - 50 nm. The specific capacitance of the MnO2/OAC6 composite exhibited a high specific capacitance of 369.7 F/g in 1 mol/L Na2SO4 solution,which was attributed to the synergistic effect of both the activated carbon porous structure and the pseudo-faradaic reactions of the MnO2 nanorods.

关 键 词：二氧化锰 超级电容器 活性炭 氧化 

分 类 号：TQ137.12[化学工程—无机化工] O646[理学—物理化学]