Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6473143 | Electrochimica Acta | 2016 | 7 Pages |
â¢A novel 3D porous Co3O4@Co(OH)2 hybrid nanostructured electrode is synthesized.â¢The Co3O4@Co(OH)2 exhibits a high specific capacity of 1876C gâ1 at 5 mA cmâ2.â¢The hybrid nanostructure allows the synergistic contribution of both materials.
A novel three-dimensional (3D) Co3O4@Co(OH)2 hybrid nanostructure is synthesized by using two-step hydrothermal and electrodeposition methods. The composite can be employed as an efficient electrode of a high-performance supercapacitor. Scanning electron microscopy and high-resolution transmission electron microscopy images show that Co(OH)2 nanosheets can grow both in the space and on the tops of Co3O4 nanotubes. In comparison with the sole Co3O4 nanotubes and Co(OH)2 nanosheets, the hybrid Co3O4@Co(OH)2 electrode with a naturally formed nanostructure exhibits much improved battery-type performances in a 3 mol Lâ1 KOH electrolyte solution, as evidenced by the high specific capacity of 1876 C gâ1 at a current density of 5 mA cmâ2. A good retention capability is also demonstrated, 83.1% of initial capacity value is maintained after 1000 cycles at a current density of 25 mA cmâ2. The observed high performances of Co3O4@Co(OH)2 hybrid electrode with the 3D nanostructure make it attractive for the development of high-efficiency electrochemical energy storage devices.