摘要
KMnO_4和MnCl_2在140℃反应釜中反应6h并掺杂不同含量的活性炭,经球磨后制备成超级电容器活性炭/MnO2复合电极材料。通过BET测试得出,当活性炭含量为29%(质量分数,下同)时,复合电极材料的比表面积为451m^2/g。XRD结果表明,复合物的物相结构主要为非晶。SEM结果表明,复合电极的形貌为细小环绕微纳米绒球。XPS谱线表明不同活性炭含量的复合物中均含有Mn^(4+)。当扫描速率为50 mV/s时,复合电极的比电容值达365F/g,充放电效率为93%,等效串联电阻值仅为0.87Ω。经3 000次循环后,复合电极中均出现不同程度的晶体相,电极形貌变成颗粒状和块状,但复合粒子的均匀性增强,比电容值仅下降约6%。
KMnO4 reacted with MnCl2 while doped different activated carbon in reaction kettle at 140℃ for 6 h,then composite electrode materials for supercapacitor were prepared after ball mill.Specific surface area of 451 m2/g was obtained through BET mehtod for content of 29 wt% activated carbon.XRD result revealed that MnO2/activated carbon composite were hydrated and amorphous.Morphology of composite was tiny and surrounded micro-nanometer pompon globe by SEM.XPS spectrum showed composite existence of Mn^4＋ in oxide form.Specific capacitance of the electrode reached 365 F/g when scan rate was 50 mV/s,and charge-discharge efficiency was 93% as well as equivalent series resistance value of 0.87Ω.Composite electrode appeared crystal phase with different degree after 3 000 cycles,meanwhile,morphology of the electrode turned into particles and block,and capacitance value of the electrode decayed to only approximate 6%.
作者
李祥
郑峰
罗援
罗泳梅
LI Xiang;ZHENG Feng;LUO Yuan;LUO Yongmei(School of Materials and Metallurgical Engineering,Guizhou Institute of Technology,Guiyang 550003;School of Materials Science and Engineering,Central South University,Changsha 410083)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第12期1949-1954,共6页
Materials Reports
基金
贵州省科学技术基金(黔科合J字[2014]2077)
贵州省科学技术联合基金(黔科合LH字[2015]7092)
关键词
活性炭
MNO2
水热沉淀法
比电容
循环性能
activated carbon
MnO2
hydrothermal precipitation method
specific capacitance
cycle property
