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http://dx.doi.org/10.5229/JKES.2009.12.1.034

Effect of Acid / Heat Treatment on Electric Double Layer Performance of Needle Cokes  

Yang, Sun-Hye (Battery Research Center, Korea Electrotechnology Research Institute)
Kim, Ick-Jun (Battery Research Center, Korea Electrotechnology Research Institute)
Choi, In-Sik (Battery Research Center, Korea Electrotechnology Research Institute)
Kim, Hyun-Soo (Battery Research Center, Korea Electrotechnology Research Institute)
Publication Information
Journal of the Korean Electrochemical Society / v.12, no.1, 2009 , pp. 34-39 More about this Journal
Abstract
In this study, a needle coke was oxidized in a mixture of dilute nitric acid and sodium chlorate ($NaClO_3$) solutions and followed by heat treatment. The samples were analyzed with using XRD, FESEM, elemental analyzer, BET, and Raman spectroscopy. Double layer capacitance was measured with the charge and discharge measurements. The consisting layers of the needle coke were expanded to single phase showing only (001) diffraction peak by the acid treatment for 24 hours. The oxidized coke returned to a graphite structure appearing (002) peak after heat treatment above $200^{\circ}C$. The structure returned could be more easily accessible to the ions by the first charge, and improve the double layer capacitance at the second charge. The two-electorde cell from acid treated coke and $300^{\circ}C$ heat treatment exhibited the maximum capacitances of 32.1 F/g and 29.5 F/ml at the potential of $0{\sim}2.5\;V$.
Keywords
Coke; Carbon oxide; Interlayer spacing; Capacitance; EDLC;
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Times Cited By KSCI : 3  (Citation Analysis)
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