摘要
Co类普鲁士蓝(CoPBA)作为令人瞩目的超级电容器阳极材料拥有高比容量和优异的循环稳定性,但较差的电子导电性限制了其倍率性能。利用ZIF-67作为前驱体合成了Co类普鲁士蓝/多壁碳纳米管(CoPBA/MWCNT)复合材料,并使用XRD、SEM和TEM对材料的结构和形貌进行表征。在三电极体系中,测得CoPBA/MWCNT电极在电流密度为1 A·g^(−1)时电容提高到312 F·g^(−1)。制备的CoPBA/MWCNT电极有利于提高材料电导率和机械稳定性,从而获得更高的电化学性能。将CoPBA/MWCNT正极和活性炭(AC)负极组装为非对称电池,测得5000圈循环后容量保留率为83.1%,循环稳定性优异。
Co Prussian blue analogue(CoPBA)has attracted much attentions as a promising anode material of supercapacitors due to its high capacity and long cycle life.But CoPBA suffers from poor electrical conductivity,leading to unsatisfied rate performance.A nanocomposite of Co Prussian blue analogue/multi-walled carbon nanotubes(CoPBA/MWCNT)composite was synthesized using ZIF-67 as a precursor.The structure and morphology of CoPBA/MWCNT were characterized by XRD,SEM and TEM.In a three-electrode system,the specific capacitance of the CoPBA/MWCNT electrode reaches up to 312 F·g^(−1)at a current density of 1 A·g^(−1).The fabrication of CoPBA/MWCNT is beneficial for improving electronic conductivity and mechanical stability,resulting in high electrochemical performance.An asymmetric supercapacitor cell is assembled with CoPBA/MWCNT as cathode and activated carbon(AC)as anode.Its capacity retention rate is 83.1%after 5000 cycles,exhibiting excellent cycling stability.
作者
杜佳琪
陈俊琳
冀佳帅
张利
刘伟
宋朝霞
DU Jiaqi;CHEN Junlin;JI Jiashuai;ZHANG Li;LIU Wei;SONG Zhaoxia(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;College of Life Science,Dalian Minzu University,Dalian 116600,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2022年第6期2724-2733,共10页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51877029)。
关键词
Co类普鲁士蓝
超级电容器
模板转化
多壁碳纳米管
非对称电池
Co Prussian blue analogue
supercapacitor
template conversion
multi-walled carbon nanotube
asymmetric supercapacitor
作者简介
通信作者:刘伟,博士,副教授,硕士生导师,研究方向为超级电容器储能材料.E-mail:liuwei08@dlut.edu.cn。
