Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 13, Pages 5779-5783Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.02.029
Keywords
Carbon nanotube; Plasma enhanced chemical vapour deposition; Supercapacitor; Electrochemical properties; Manganese oxide
Funding
- AGAUR of Generalitat de Catalunya [2009SGR00185]
- MICINN of Spain [CTQ2009-14674-C02-01]
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The optimization strategy for producing manganese oxide supercapacitors based on vertically aligned carbon nanotubes (VACNTs) deposited on large area electrodes is presented. A single sequential process of sputtering, annealing and plasma enhanced chemical vapour deposition (PECVD) is applied to produce dense and uniform VACNTs electrodes. As dielectric layer of the supercapacitor, manganese oxide is electrodeposited lining the surface of the VACNTs electrodes. The control of the growing parameters such as catalyst thickness layer, temperature and deposition time for tuning the density, length and diameter of the VACNTs and their structure are found to be key points for the optimization of the MnO2 electrodeposition process in view to improve the efficiency of the supercapacitor devices. The electrochemical properties of the obtained electrodes are characterized using cyclic voltammetry and galvanostatic charge-discharge techniques. A specific capacitance of 642 Fg(-1) is obtained for MnO2/VACNTs nanocomposite electrode at a scan rate of 10 mV s(-1). (C) 2011 Elsevier B.V. All rights reserved.
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