TITLE

Application of microelectrodes for investigation of the oxygen electrode reaction in selected solid electrolytes

AUTHOR(S)
Raźniak, A.; Tomczyk, P.
PUB. DATE
March 2008
SOURCE
Materials Science (0137-1339);2008, Vol. 26 Issue 1, p195
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In a solid oxide fuel cell (SOFC), the most often used solid electrolyte is yttria stabilized zirconia. Usually, SOFC of a tubular geometry operates at ca. 1000 °C. To decrease the temperature of the cell, it is necessary to reduce the thickness of electrolyte or replace yttrium-stabilized zirconium with an other electrolyte of a much higher ionic conductivity. A potential candidate for an electrolyte in intermediate temperature SOFC is gadolinia doped ceria. The largest energetic losses in a fuel cell of this type, apart of ohmic polarizations, are attributed to slow kinetics of the cathodic process. In this work, investigated oxygen electrode reaction for two various electrolytes: yttria stabilized zirconia and gadolinia doped ceria. The measurements were conducted using microelectrodes the which analysis of kinetic parameters of the electrode reaction is easier. Gold electrodes were applied in the experiments. Although Au is a good electrocatalyst for oxygen reduction, almost no research has been done for this metal so far. The performance of the electrode and results of impedance measurements have been presented and discussed.
ACCESSION #
33964098

 

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