Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 176, Issue 14, Pages 1073-1078Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2011.05.043
Keywords
Supercapacitor; Manganese dioxides; Specific capacitance; Charge-discharge; Carbon nanotubes
Funding
- New Century Excellent Talents in University [NCET-08-0205]
- Guangdong Provincial Natural Science Foundation of China [9251064101020]
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A nanocomposite of manganese dioxide coated on the carbon nanotubes (MnO2/CNTs) was synthesized by a facile direct redox reaction between potassium permanganate and carbon nanotubes without any other oxidant or reductant addition. The morphology, microstructure and crystalline form of this MnO2/CNT nanocomposite were characterized by scanning electron microscopy (SEM), transition electron microscopy (TEM). X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical properties are characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge/discharge (GCD). The results show that the facile prepared MnO2/CNTs nanocomposite shows specific capacitance of 162.2 Fg(-1) at the current density of 0.2 A g(-1) and excellent charge/discharge property with 90% of its specific capacitance kept after 2000 cycles at the current density of 5 A g(-1) (C) 2011 Elsevier BM. All rights reserved.
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