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Preparation of Graphite Oxide and its Electrochemical Double Layer Capacitor's Performances using Non-Aqueous Electrolyte (TEABF4 & TEMABF4)  

Yang, Sunhye (Korea Electrotechnology Research Institute)
Kim, Ick-Jun (Korea Electrotechnology Research Institute)
Jeon, Min-Je (Korea Electrotechnology Research Institute)
Moon, Seong-In (Korea Electrotechnology Research Institute)
Kim, Hyun-Soo (Korea Electrotechnology Research Institute)
An, Kye-Hyeok (Sungkyunkwan University)
Lee, Yun-Pyo (Sungkyunkwan University)
Lee, Young-Hee (Sungkyunkwan University)
Publication Information
Applied Chemistry for Engineering / v.18, no.3, 2007 , pp. 291-295 More about this Journal
Abstract
The oxidation treatment of needle cokes with 70 wt% of nitric acid and sodium chlorate ($NaClO_3$) was attempted to achieve an electrochemically active material with a large capacitance. The structure of needle cokes was changed to graphite oxide after oxidation treatment of needle cokes with acidic solution having the composition ratio, $NaClO_3$/needle cokes, of 7.5, and the inter-layer distance of the oxidized needle cokes was extended to $6.9{\AA}$with increasing oxygen content. On the other hand, the electrochemical performance of oxidized needle cokes as a polarized electrode for an Electric Double Layer Capacitor (EDLC) was examined with an electrolyte of 1.2 M $TEABF_4$ (tetraethylammonium tetrafluoroborate) and $TEABF_4$ (triethylmethylammonium tetrafluoroborate) in acetonitrile. The capacitor cell using 1.2 M $TEABF_4$/acetonitrile has exhibited smaller electric resistance of $0.05{\Omega}$, and larger capacitance per weight and volume of 32.0 F/g and 25.5 F/mL at the two-electrode system in the potential range 0~2.5 V than that of the capacitor cell using $TEABF_4$. The observed electrochemical performance was discussed with the correlation between the inter-layer distance in graphite oxide structure and the anionic size of electrolyte.
Keywords
graphite oxide; inter-layer spacing; capacitance; non-aqueous electrolyte; EDLC;
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