A method to obtain a Ragone plot for evaluation of carbon nanotube supercapacitor electrodes

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2010-08-01

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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.

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10.1557/jmr.2010.0192

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Raut, AS, CB Parker and JT Glass (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.

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Scholars@Duke

Charles Parker

Senior Laboratory Administrator
Glass

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 appointments he was the Vice President of R&D for Kobe Steel USA Inc. Jeff received his Bachelors and Masters degrees from Johns Hopkins University, and a Ph.D. in Materials Science and Engineering from the University of Virginia. He also received an MBA from Duke University's Global Executive (GEMBA) program.

His current research involves electronic materials and the associated devices/instruments improved by these materials. In particular, miniature mass spectrometer development and engineered systems for waste treatment are systems of focus for his lab. He is also involved in the development of joint educational, research and technology transfer activities related to the intersection of business and technology. He consults and holds advisory board appointments with various companies in materials-related areas and has served as an expert witness in patent litigation. Prior to his appointment at CWRU, he was the Vice President of R&D for Kobe Steel USA Inc. with a focus on electronic materials. Prior to joining Kobe Steel, he was a tenured faculty member in the Department of Materials Science and Engineering at North Carolina State University. He has been involved in the study of Innovation Management in technology-based organizations with a focus on the early stages of technical development and received the 2004 Industrial Research Institute’s Maurice Holland Award for his paper entitled “Managing the Ties Between Central R&D and Business Units.”

Jeff's technical research has focused on the growth and characterization of thin films for electronics, including carbon nanotubes, graphene, graphenated carbon nanotubes, diamond, silicon carbide and chalcogenides. Chemical vapor deposition, sputtering, materials analysis and electronic/electrochemical properties are his areas of interest. Miniature mass spectrometers, decentralized waste treatment, smart toilets and photoelectrochemical energy conversion devices are some of the applications his lab focuses on. He has published over 175 papers and book chapters, edited seven books and is a co-inventor on 14 patents. He has been a short course instructor for several professional societies and companies and has organized numerous conferences. He has given over 75 invited presentations in 12 different countries. He served as a member of a Presidential Science Advisor's committee for the assessment of diamond technology in Japan and has received two teaching awards and the National Science Foundation Presidential Young Investigator award. He has held adjunct faculty appointments at North Carolina State University, Case Western Reserve University and the Kenan-Flagler Business School at the University of North Carolina where he has taught executive courses on Managing Innovation.


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