Chemical Vapor-Deposited Carbon Nanotubes as Electrode Material for Supercapacitor Applications
| Autor: | James N. Turner, Tara P. Dhakal, Ganesh Sainadh Gudavalli |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Materials science Equivalent series resistance Mechanical Engineering 02 engineering and technology Chemical vapor deposition Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Capacitance 0104 chemical sciences law.invention Dielectric spectroscopy Potential applications of carbon nanotubes Chemical engineering Mechanics of Materials law General Materials Science Cyclic voltammetry 0210 nano-technology |
| Zdroj: | MRS Advances. 2:3263-3269 |
| ISSN: | 2059-8521 |
| DOI: | 10.1557/adv.2017.424 |
| Popis: | We report the capacitance of entangled carbon nanotubes (CNTs) synthesized on flexible carbon fabric via water-assisted chemical vapor deposition. The CNTs were grown at atmospheric pressure with iron (Fe) as the catalyst, ethylene (C2H4) and 5%/95% H2/Ar as precursor gasses, and aluminum oxide as a buffer/barrier layer. The effect of the catalyst thickness (5 and 10 nm) on the specific capacitance was studied. The capacitance behavior of CNTs was evaluated by cyclic voltammetry measurements via a three-electrode system. The highest specific capacitance, approximately 56 F/g, was obtained for electrodes with 5nm Fe thickness. A nearly rectangular shaped cyclic voltammogram was exhibited for the CNTs grown on the carbon fabric. A specific power density of 0.012 KW/Kg and specific energy density 0.15 Wh/Kg were calculated from the galvanic charge/discharge (CD) curves. In addition, electrochemical impedance spectroscopy (EIS) revealed a characteristic supercapacitive behavior with a low equivalent series resistance of 7 Ocm2. |
| Databáze: | OpenAIRE |
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