On the electrochemical activation of alkali-treated soft carbon for advanced electrochemical capacitors

On the electrochemical activation of alkali-treated soft carbon for advanced electrochemical capacitors

The electrochemical activation process of the so-called “alkali-treated soft carbon” (ASC) has been examined in organic electrolyte solutions. SEM observation demonstrated that the edge plane of graphene structure of the ASC particle becomes rough after the activation, and XRD measurements indicated...

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Bibliographic Details
Published in:Journal of applied electrochemistry Vol. 44; no. 4; pp. 447 - 453
Main Authors: Morita, Masayuki, Arizono, Ryo, Yoshimoto, Nobuko, Egashira, Minato
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-04-2014
Subjects:
Activation
Carbon
Cations
Chemistry
Chemistry and Materials Science
Electrochemical activation
Electrochemistry
Electrodes
Graphene
Industrial Chemistry/Chemical Engineering
Insertion
Physical Chemistry
Porosity
Research Article
Ion insertion
Electrochemical activation
Capacitor
Soft carbon
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Summary:The electrochemical activation process of the so-called “alkali-treated soft carbon” (ASC) has been examined in organic electrolyte solutions. SEM observation demonstrated that the edge plane of graphene structure of the ASC particle becomes rough after the activation, and XRD measurements indicated that the average lattice constant of graphene stacking in ASC increases after the activation process. Ex-situ 7 Li NMR measurements proved that the insertion of cation (Li + ) into the pore structure of ASC is associated with the activation process in the electrolyte dissolving Li salt. The pore-size distribution determined from N 2 -gas adsorption for ASC electrodes before and after the electrochemical activation indicates that the pore structure becomes developed after the electrochemical polarization, especially in the pore-diameter range of 2–10 nm. A schematic model of the activation process has been presented, which includes electrochemical insertion of ions into the inside of the ASC.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-013-0634-2