Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1520433 | Materials Chemistry and Physics | 2016 | 6 Pages |
Abstract
A room-temperature thermal substrate process, induction heating deposition was introduced to fabricate a layer of porous nickel-based compounds on nickel foam as supercapacitor electrode materials. The as-prepared film was composed of sheet-like NiO, Ni2O3, NiOOH and 3Ni(OH)2·2H2O (α-Ni(OH)2). It possessed a hierarchical 3D-interconnected porous nanostructure with reasonable pore size distribution, among which nickel foam provided macropores, the produced 3D-interconnected sheet supplied mesopores ranging from 8 nm to 80 nm at a peak of 14 nm, while smaller mesopores with a size of about 2.5 nm were directly fomed on the sheet-like crystals. This unique pore nanostructure of the nickel (hydr)oxide compounds, desipte its specific area of only 48 m2 gâ1, could not only facilitate the diffusion of electrolyte into the electrode material surface, but also offer more active sites for the electrochemical redox reactions. Thus, the film delivered a very high areal capacitance of 4.5 and 3.2 F cmâ2 at 6 and 30 mA cmâ2 corresponding to 2250 and 1600 F gâ1 at 3 and 15 A gâ1, as well as an excellent rate capability (71.1% capacitance retention from 6 to 30 mA cmâ2) and good cycling stability (77.7% capacitance retention after 2000 cycles).
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Xin-bo Xiong, Jia-yuan Zhang, Jun Ma, Xie-rong Zeng, Haixia Qian, Ya-yun Li,