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Chemical Vapor-Deposited Carbon Nanotubes as Electrode Material for Supercapacitor Applications

Published online by Cambridge University Press:  13 June 2017

Ganesh Sainadh Gudavalli ,
James N. Turner  and
Tara P. Dhakal
Ganesh Sainadh Gudavalli
Affiliation:
Center for Autonomous Solar Power (CASP), Binghamton University, Binghamton, NY13902 Department of Electrical and Computer Engineering, Binghamton University, Binghamton, NY13902
James N. Turner
Affiliation:
Small Scale Systems Integration & Packaging Center, Binghamton University, Binghamton, NY13902
Tara P. Dhakal*
Affiliation:
Center for Autonomous Solar Power (CASP), Binghamton University, Binghamton, NY13902 Department of Electrical and Computer Engineering, Binghamton University, Binghamton, NY13902
*
*Corresponding Author: tdhakal@binghamton.edu
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Abstract

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 Ωcm2.

Type
Articles
Information
MRS Advances , Volume 2 , Issue 54: Energy Storage and Conversion , 2017 , pp. 3263 - 3269
Copyright
Copyright © Materials Research Society 2017 

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