Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7709260 | International Journal of Hydrogen Energy | 2017 | 10 Pages |
Abstract
The development of electrode materials with hierarchically porous structure and high electrochemical stability is crucial for the electric energy density of supercapacitors. Hollow microspheres of Ni-Co layered double hydroxides (LDHs) and Ni-Mn LDHs are fabricated with a simple co-precipitation method at low temperature using SiO2 microspheres as a sacrifice template. The as-fabricated two LDH hollow microspheres possess a unique 3D architecture and exhibit high specific capacitance, as well as excellent rate and cycling performances as electrode materials of supercapacitors. A specific capacitance of 1766.4â¯Fâ¯gâ1 at 1â¯Aâ¯gâ1 is achieved for Ni-Co LDHs electrode, much higher than that of Ni-Mn LDHs. A hybrid capacitor composed of Ni-Co LDHs hollow spheres and activated carbon is fabricated and evaluated for practical application, providing an energy density of 44.3â¯Whâ¯kgâ1 at a power density of 0.425â¯kWâ¯kgâ1. This study indicates that the hollow LDH microsphere prepared by our method is a promising material for supercapacitors.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
M. Li, PengWei Yuan, SongHao Guo, F. Liu, J.P. Cheng,