Journal
CHEMICAL ENGINEERING JOURNAL
Volume 280, Issue -, Pages 377-384Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.06.053
Keywords
Cobalt oxides; Supercapacitor; Solvothermal method; Electrochemical property
Categories
Funding
- Natural Science Foundation of China [11274138, 10604020]
- Science and Technology Development Plan of Jilin Province [20116007]
- Science And Technology Development Plan of Changchun [13KG13]
- International Cooperation Projects Of Science and Technology of Changchun [13GH10]
- Special Program of International Science and Technology Cooperation Projects of China [2014DFR61140]
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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 (similar to 186.27 m(2) g(-1)). 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 Fg(-1) at a current density of 1 Ag-1, which is higher than that of the pure CoO electrode (203 Fg(-1)). Interestingly, the CoO/Co3O4 shows a low equivalent series resistance (0.16 Omega) 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 kg(-1) at a power density of 140 W kg(-1). These results indicate the CoO/Co3O4 composites will be a promising electrode material for high-performance supercapacitor applications. (C) 2015 Elsevier B.V. All rights reserved.
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