Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6584654 | Chemical Engineering Journal | 2015 | 8 Pages |
Abstract
The porous mixed-phase CoO/Co3O4 nanocomposites have been prepared by a facile ethanol-assisted solvothermal approach without a subsequent calcination process and the composites are formed by aggregations of many nanoparticles with an average diameter of 5 ± 2 nm. The porous structures are verified by BET test results with a typical type-IV isotherm curve and a high surface area (â¼186.27 m2 gâ1). Electrochemical properties are characterized by cyclic voltammetry, galvanostatic charge-discharge measurements and electrochemical impedance spectroscopy. The CoO/Co3O4 electrode exhibits a high capacitance of 451 Fgâ1 at a current density of 1 Agâ1, which is higher than that of the pure CoO electrode (203 Fgâ1). Interestingly, the CoO/Co3O4 shows a low equivalent series resistance (0.16 Ω) and superior cycle stability (108% retention after 5000 cycles). Moreover, an asymmetric supercapacitor based on this hybrid CoO/Co3O4 and activated carbon can deliver an energy density of 10.52 Wh kgâ1 at a power density of 140 W kgâ1. These results indicate the CoO/Co3O4 composites will be a promising electrode material for high-performance supercapacitor applications.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Mingjun Pang, Guohui Long, Shang Jiang, Yuan Ji, Wei Han, Biao Wang, Xilong Liu, Yunlong Xi, Dongxue Wang, Fuzhan Xu,