Journal
CHEMICAL ENGINEERING JOURNAL
Volume 242, Issue -, Pages 397-403Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.04.069
Keywords
Synthesis; MnO2/C; Mesoporous sphere; Supercapacitor
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Funding
- National Natural Science Foundation of China (NSFC) [20976033, 21176054, 21271058]
- Fundamental Research Funds for the Central Universities [2010HGZY0012]
- Education Department of Anhui Provincial Government [TD200702]
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A mesoporous MnO2/C composite with spherical morphology and large surface area of 324 m(2)/g has been successfully prepared at room temperature by a redox process between KMnO4 and carbon spheres which were hydrothermally synthesized and used without any previous activation treatment. The composition, morphology and structure of the obtained material are examined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) and nitrogen adsorption-desorption. Supercapacitive performance of the MnO2/C samples as active electrode materials has been evaluated by cyclic voltammetry (CV) and galvanostatic charge-discharge. The results of electrochemical tests indicate that the mesoporous MnO2/C composite with 72.86 wt% of MnO2 exhibits a high specific capacitance of 383 F/g at 2 mV/s and demonstrates a superior long-term cyclic stability, with specific capacitance retention about 82.2% of the initial value after 1000 cycles. (C) 2013 Elsevier B.V. All rights reserved.
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