A method to obtain a Ragone plot for evaluation of carbon nanotube supercapacitor electrodes
Abstract
Electrochemical double layer capacitors, also referred to as supercapacitors, are
a promising technology in the field of energy storage. Carbon nanotube (CNT)-based
supercapacitors are particularly interesting because of CNTs' high surface area and
conductivity. CNT supercapacitors can potentially be used in hybrid electric vehicles
due to their higher power density. Comparing energy storage systems that store energy
in different ways, such as batteries, fuel cells, supercapacitors, and flywheels,
requires that an appropriate set of performance data be collected. A Ragone plot is
a log-log plot of a device's energy density versus power density, giving insight into
its operational range. A method to obtain Ragone plots for CNT-based supercapacitors
in a three-terminal electrochemical cell was adapted from a technique to test commercial
capacitors for electric vehicles. Ragone plots for different types of as-grown CNT
electrodes in different electrolytes are presented, along with the procedural details
of this new method to obtain electrode-specific energy and power densities. Additionally,
a theoretical weight calculation for a carbon nanotube film was derived and validated
with a direct weight measurement of a CNT film. This weight was used in the specific
energy and power densities for the Ragone plot. © 2010 Materials Research Society.
Type
Journal articlePermalink
https://hdl.handle.net/10161/4609Published Version (Please cite this version)
10.1557/jmr.2010.0192Publication Info
Raut, AS; Parker, CB; & Glass, JT (2010). A method to obtain a Ragone plot for evaluation of carbon nanotube supercapacitor
electrodes. Journal of Materials Research, 25(8). pp. 1500-1506. 10.1557/jmr.2010.0192. Retrieved from https://hdl.handle.net/10161/4609.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Show full item recordScholars@Duke
Jeffrey Glass
Professor of Electrical and Computer Engineering
Jeffrey T. Glass is a Professor in the Department of Electrical and Computer Engineering
and Director of the Institute for Enterprise Engineering. He holds the Hogg Family
endowed chair in Engineering Management and Entrepreneurship. Formerly, he was the
Co-Director of The Institute for the Integration of Management and Engineering at
Case Western Reserve University (CWRU) and held the Joseph F. Toot, Jr. endowed chair
in the Case School of Engineering. Prior to these university appointment
Charles Parker
Senior Laboratory Administrator
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