物理学报2017，Vol.66Issue(12)：320-328,9.DOI:10.7498/aps.66.128201
基于镍泡沫支撑的Co3O4纳米多孔结构的高性能超级电容器电极
Co3O4 mesoporous nanostructure supported by Ni foam as high-performance supercapacitor electrodes
摘要
Abstract
In various energy conversion and storage devices, supercapacitors have been extensively used due to their high power densities, fast delivery rates, and exceptionally long cycle lives. However, the low specific capacitances and low energy densities of supercapacitors largely hinder widespread applications in large-scale energy conversion and storage systems. To improve the specific capacitances of the supercapacitors, the surface areas of the electrode materials should be made as large as possible to allow the capturing and releasing of "particles" (such as ions, molecules, or electric charges). Here in this work, we demonstrate an efficient approach to the large-scale production of Co3O4 mesoporous nanostructure supported by Ni foam via a simple hydrothermal synthesis followed by ambient annealing at 300 ?C for 4 h. The designed and fabricated Co3O4 mesoporous nanostructures directly serve as binder- and conductive-agent-free electrodes for supercapacitors, which thus provide more chemical reaction sites, shorten the migration paths for electrons and ions, and improve the electrical conductivity. By taking advantage of the structural features and excellent electronic conductivity, the Co3O4 exhibits the ultrahigh specific capacitances (1.87 F·cm-2 (936 F·g-1 and 1.80 F·cm-2 (907 F·g-1 at current densities of 2.5 mA·cm-2 and 5.5 mA·cm-2, respectively), high rate capacitances (48.37% of the capacitance can be retained when the current density increases from 2.5 mA·cm-2 to 100 mA·cm-2 and excellent cycling stability (92.3% of the capacitance can be retained after 4000 charge/discharge cycles at a current density of 10 mA·cm-2. The nanostructuring approach and utilizing a binder- and conductive-agent-free electrode can be readily extended to other electrochromic compounds of high-performance energy storage devices.关键词
多孔纳米结构/超级电容器/高性能/循环稳定性Key words
mesoporous nanostructure/supercapacitor/high-performance/cycling stability引用本文复制引用
张诚,邓明森,蔡绍洪..基于镍泡沫支撑的Co3O4纳米多孔结构的高性能超级电容器电极[J].物理学报,2017,66(12):320-328,9.基金项目
贵州省普通高等学校低维凝聚态物理重点实验室(批准号:黔教合KY字 [2016]002 和贵州省科学技术基金(批准号:黔科合J字[2011]2097号)资助的课题. Project supported by the Guizhou Province Key Laboratory of Low Dimensional Condensed Matter Physics of Higher Educational Institution(Grant No. [2016]002 and the Natural Science Foundation of Guizhou Province, China(Grant No. QKH-J[2011]2097). （批准号:黔教合KY字 [2016]002 和贵州省科学技术基金(批准号:黔科合J字[2011]2097号）
