泡沫镍上生长的具有三明治纳米结构的MnCo2O4@NiCoMnS4用于高性能水系非对称超级电容器
High-performance aqueous asymmetric supercapacitors with a cathode of MnCo2O4 nanowires sandwiched by NiCoMnS4 nanosheets on Ni foam
陈勇超 1李亚丽 1董云霞 1李东昊 1沈思锦 1胡继东 1付玉军 1贺德衍 1栗军帅1
作者信息
- 1. LONGi Institute of Future Technology,and School of Materials & Energy,Lanzhou University,Lanzhou 730000,China
- 折叠
摘要
本文介绍了一种由水热生长的MnCo2O4(MCO)纳米线以及随后电沉积的NiCoMnS4(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm-2处实现了 12,020.8 mF cm-2的高电容,并展现出良好的倍率性能以及循环稳定性.电化学测试表明,组装成的水性非对称超级电容器在0.800 mWcm-2的功率密度下,达到0.611 mW h cm-2的高能量密度并具有良好的循环稳定性,即在15,000次充放电循环后,容量保持率可达90％,且保持100％的库仑效率.
Abstract
In this work,a high-performance cathode comprising hydrothermally grown MnCo2O4(MCO)nano-wires sandwiched by the subsequently electrodeposited Ni-CoMnS4(NCMS)nanosheets,i.e.,MCO@NCMS on Ni foam,is developed.Due to its highly porous and interconnected nanostructure and the synergistic effect of its MCO and NCMS components,an outstanding capacitance of 12,020.8 mF cm-2 at 1 mA cm-2 is achieved.In addition,this cathode displays remarkable performance in terms of rate capability and cycle stability.Electrochemical analysis shows that the corre-sponding aqueous asymmetric supercapacitors have a highly competitive energy density of 0.611 mW hcm-2(at 0.800 mW cm-2)and robust cycling performance,i.e.,～90％retention of the initial capacitance and 100％Coulombic ef-ficiency over 15,000 charge-discharge cycles.
关键词
sandwich structure/high energy density/transition metal sulfides/aqueous asymmetric supercapacitor/transition metal oxidesKey words
sandwich structure/high energy density/transition metal sulfides/aqueous asymmetric supercapacitor/transition metal oxides引用本文复制引用
基金项目
Natural Science Foundation of Gansu,China(20JR10RA611)
Natural Science Foundation of Gansu,China(22YF7GA009)
中央高校基本科研业务费专项(lzujbky-2021-sp54)
出版年
2024
NETL
NSTL
万方数据