Electrochemical activation behaviors studied with graphitic carbon electrodes of different interlayer distance

A comparative study is made on the electrochemical activation behaviors for graphitic carbon electrodes having different interlayer distance: a pristine graphite (MCMB, mesocarbon microbead, 0.34nm), an expanded graphite (e-MCMB, 0.41nm), and a silica-pillared one (s-MCMB, 1.24nm). The pristine MCMB...

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Bibliographic Details
Published in:Electrochimica acta 2011-11, Vol.56 (27), p.9931-9936
Main Authors: Yoo, Hyun D., Park, Yuwon, Ryu, Ji Heon, Oh, Seung M.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors. Resistors. Filters
Carbon
Electrical engineering. Electrical power engineering
Electrochemical activation
Electrochemical capacitor
Electrodes
Exact sciences and technology
Expanded graphite
Graphite
Interlayer distance
Interlayers
Microorganisms
Pillared graphite
Porosity
Swelling
Various equipment and components
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Summary:A comparative study is made on the electrochemical activation behaviors for graphitic carbon electrodes having different interlayer distance: a pristine graphite (MCMB, mesocarbon microbead, 0.34nm), an expanded graphite (e-MCMB, 0.41nm), and a silica-pillared one (s-MCMB, 1.24nm). The pristine MCMB does not show any electrochemical activation behavior. In the case of e- and s-MCMB, however, the electrochemical activation is indeed occurring but completed in the earlier period of the first charging with a substantial electrode swelling. Of the two, the electrochemical activation is easier for the s-MCMB electrode with a lower activation potential and less significant electrode expansion. Moreover, the s-MCMB electrode gives a better rate capability after the electrochemical activation. The impedance analysis based on the transmission-line model with pore size distribution (TLM-PSD) illustrates that the electrochemically activated s-MCMB has a more ion-accessible pore structure as compared with e-MCMB.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2011.08.117