期刊
ELECTROCHIMICA ACTA
卷 206, 期 -, 页码 278-290出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.04.137
关键词
MnO2/MnCo2O4; solution combustion; mesoporous spinel nanostructure; supercapacitor
资金
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20131402120004]
- Natural Science Foundation for Young Scientists of Shanxi Province, China [2014021018-1]
High quality MnO2/MnCo2O4 composites have been successfully synthesized by a one-step solution combustion process at 300 degrees C for 2 h in air. The effects of the amount of glycine and molar ratios of Mn/Co on phase composition, morphology and electrochemical properties of products were investigated. The prepared samples were characterized by X-ray diffraction, field-emission scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and Brunauer-Emmett-Teller methods. Based on the optimum fuel/oxidizer molar ratios, the products transformed from spinel MnCo2O4 granular aggregates to a mixture of MnO2/MnCo2O4 composites with increase the molar ratios of Mn/Co. The electrochemistry performance of prepared different specimens were evaluated and compared through cyclic voltammetry and charge-discharge anylysis in 2.0 M KOH electrolytic solution. Electrochemical measurements showed that the MnO2/MnCo2O4 exhibited a optimal electrochemistry performance with the Mn: Co: glycine molar ratio of 3: 4: 31.5/9. The maximum specific capacitance of 497 F/g is achieved at a current density of 0.5 A/g (or 312 F/g at 10 A/g). The high electrochemical performance would be attributed to the numerous nanopores, large specific surface and synergistic effects of the MnO2 and spinel MnCo2O4. (c) 2016 Elsevier Ltd. All rights reserved.
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