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A Study on Oxidized Glassy Carbon sheets for Bipolar Supercapacitor Electrodes

Published online by Cambridge University Press:  10 February 2011

A. Braun ,
M. Bärtsch ,
F. Geiger ,
B. Schnyder ,
R. Kötz ,
O. Haas ,
M. Carlen ,
T. Christen ,
C. Ohler  and
P. Unterinahrer
...Show all authors
A. Braun
Affiliation:
Paul Scherrer Institute, Dept. General Energy Research, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland, www.psi.ch, artur.braun@psi.ch
M. Bärtsch
Affiliation:
Paul Scherrer Institute, Dept. General Energy Research, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland, www.psi.ch, artur.braun@psi.ch
F. Geiger
Affiliation:
Paul Scherrer Institute, Dept. General Energy Research, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland, www.psi.ch, artur.braun@psi.ch
B. Schnyder
Affiliation:
Paul Scherrer Institute, Dept. General Energy Research, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland, www.psi.ch, artur.braun@psi.ch
R. Kötz
Affiliation:
Paul Scherrer Institute, Dept. General Energy Research, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland, www.psi.ch, artur.braun@psi.ch
O. Haas
Affiliation:
Paul Scherrer Institute, Dept. General Energy Research, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland, www.psi.ch, artur.braun@psi.ch
M. Carlen
Affiliation:
ABB Corporate Research Ltd., CH - 5405 Baden-Dittwil, Switzerland
T. Christen
Affiliation:
ABB Corporate Research Ltd., CH - 5405 Baden-Dittwil, Switzerland
C. Ohler
Affiliation:
ABB Corporate Research Ltd., CH - 5405 Baden-Dittwil, Switzerland
P. Unterinahrer
Affiliation:
ABB Corporate Research Ltd., CH - 5405 Baden-Dittwil, Switzerland
E. Krause
Affiliation:
Leclanché S.A., CH - 1401 Yverdon-les-Bains, Suisse
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Abstract

Electrochemical Double Layer Capacitors (EDLC) for high energy and power density applications, based on glassy carbon (GO) electrodes, are being developed in our laboratory. In the context of this project, GC sheets were oxidized and investigated with Small Angle X-ray Scattering (SAXS), Electrochemical Impedance Spectroscopy (EIS) and Nitrogen Gas Adsorption (BET). During oxidation an active film with open pores is built on the surface of the GC. Upon oxidation, the internal volumetric surface area of the active film decreases, whereas the volumetric electrochemical double layer capacitance increases. We show that this effect is correlated with the opening, the growth and the coalescence of the pores.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 369
Copyright
Copyright © Materials Research Society 2000

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References

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