组合法制备MnO_2/活性碳复合电极材料及其电化学性能研究  

MnO_2/activated carbon composite electrode materials prepared by combination method and its electrochemical performance

作　　者：李祥 郑峰[2] 罗援 罗泳梅 张琼 LI Xiang;ZHENG Feng;LUO Yuan;LUO Yongmei;ZHANG Qiong(School of Materials and Metallurgical Engineering ,Guizhou Institute of Technology,Guiyang 550003,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]贵州理工学院材料与冶金工程学院,贵阳550003 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《功能材料》2017年第8期186-189,196,共5页Journal of Functional Materials

基　　金：贵州省科学技术基金资助项目(黔科合J字[2014]2077);贵州省科学技术联合基金资助项目(黔科合LH字[2015]7092)

摘　　要：在不同温度的反应釜中使KMnO_4与MnCl_2进行反应并掺杂活性碳,然后组合球磨工艺制备了超级电容器复合电极材料。XRD揭示MnO_2/活性碳复合物低于140℃烧结5h为水合非晶态,而165℃烧结时,开始呈现弱的衍射峰。通过SEM分析得出电活性复合物形貌呈现为细小环绕微纳米晶须球状。采用循环伏安、怛流充放电及阻抗谱测试MnO_2/活性碳复合电极的电化学性能。当扫描速率为10 mV/s时,MnO_2/活性碳复合电极的比电容值达365F/g且等效串联电阻值仅为1.32Ω。经3 000次循环后复合电极的比电容值仅下降约6%。KMnO4was reacted with MnCl2in reaction kettle at different temperature and doped with activated carbon.Then composite electrode materials for supercapacitor were prepared by combining ball mill process.XRD revealed that MnO2/activated carbon composite was hydrated amorphous while sintered at low140°C for5h.Meanwhile,the composite showed diffraction peaks at sintering temperature of165°C.SEM analysis illus-trated that the morphology of the electroactive composite was tiny and surrounded micro-nanometer whisker globe.Electrochemical performances of composite electrode were tested by cyclic voltammetry,galvanostatic charge-discharge and impedance spectrum.When scan rate was10mV/s,specific capacitance of the electrode reached365F/g and equivalent series resistance value was of1.32O.After3000cycles,capacitance value of composite electrode decayed by approximately6%.

关 键 词：超级电容器 活性碳 比电容 循环性能 

分 类 号：O614.8[理学—无机化学]