Non-porous carbon for a high energy density electric double layer capacitor

Citation
M. Takeuchi et al., Non-porous carbon for a high energy density electric double layer capacitor, ELECTROCH, 69(6), 2001, pp. 487-492
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
ELECTROCHEMISTRY
ISSN journal
1344-3542 → ACNP
Volume
69
Issue
6
Year of publication
2001
Pages
487 - 492
Database
ISI
SICI code
1344-3542(200106)69:6<487:NCFAHE>2.0.ZU;2-G
Abstract
Apparently non-porous activated carbon with a specific surface area less th an 100 m(2)/g(BET) prepared from calcined carbon of petroleum coke is studi ed as the polarized electrode for an Electric Double Layer Capacitor(EDLC), The non-porous carbon makes negligibly small electric double layer when it is dipped into an electrolyte solution in the beginning. During the initia l charging process, however, "solvent co-intercalation of ions" builds doub le layers in the positive and the negative electrodes, and during the disch arging process, the excess ions go out, while the opposite ions come in, to maintain the double layers electrically neutral. After that, the electrode s behave like conventional activated porous carbon electrodes with an extra high dense capacitance. The observed phenomenon is discussed from the view points of the inter-layer distance in graphite-like structure, the molecula r volume of solvent for electrolyte, the residual functional groups such as active oxidized hydrogen observed by NMR, and of the elimination method fo r the residual active oxidized hydrogen by heat treatment in H-2 atmosphere , as well as the preparation method for source carbon.