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Modification of a Carbon Electrode Surface by Cold Plasma Treatment for Electric Double Layer Capacitors

Published online by Cambridge University Press:  10 February 2011

Masashi Ishikawa ,
Atsushi Sakamoto ,
Masayuki Morita ,
Yoshiharu Matsuda  and
Koichi Ishida
Masashi Ishikawa
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2557 Tokiwadai, Ube 755, Japan
Atsushi Sakamoto
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2557 Tokiwadai, Ube 755, Japan
Masayuki Morita
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2557 Tokiwadai, Ube 755, Japan
Yoshiharu Matsuda
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Kansai University, 3–3–35 Yamate-cho, Suita 564, Japan
Koichi Ishida
Affiliation:
Industrial Technology Institute, Yamaguchi Prefectural Government, 585–1 Asada-Yugaki, Yamaguchi 753, Japan
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Abstract

Activated carbon fiber cloth (ACFC) electrodes whose surface was modified by “pulsed cold plasma”, i.e., low-temperature plasma generated by a pulsed electric power in argon-oxygen mixed gas at a reduced pressure, were applied to electric double layer (EDL) capacitors with an organic electrolyte composed of propylene carbonate and tetraethylammonium tetrafluoroborate (TEABF4). The treatment of the ACFC electrodes with the pulsed cold plasma increased total capacitance in the EDL capacitors. The observed increase in the total capacitance was ascribed mainly to an ascertained increase in capacitance of a negative ACFC electrode involving TEA+ cation adsorption/desorption with the cold plasma treatment. No obvious increase in capacitance of a positive ACFC electrode involving BF4- anion adsorption/desorption was observed with the plasma treatment. The chemical and electrochemical characteristics of a treated ACFC interface were found to be favorable for TEA+ cation adsorption/desorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 655
Copyright
Copyright © Materials Research Society 1998

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References

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