The electrochemical behavior of high temperature fuel cell cathodes made by screen printing
Book
·
OSTI ID:33607
- Research Centre Juelich (Germany)
- Fraunhofer Inst. for Ceramic Technologies and Sintered Materials, Dresden (Germany)
The dependence of the electrochemical behavior of perovskite cathodes on the composition of the electrode, the iron impurity content of the electrolyte, the sintering temperature and the operating temperature was investigated. With La{sub .79}Sr{sub .16}Mn{sub .80}Co{sub .20}O{sub 3} cathodes, the current density of the oxygen exchange reaction is more than one order of magnitude higher than that observed with La{sub .84}Sr{sub .16}MnO{sub 3} cathodes. At typical operating conditions, the apparent activation energy of the oxygen reduction reaction is about 2 eV in the case of the La{sub .84}Sr{sub .16}MnO{sub 3} cathodes, but only about 1 eV if La{sub .79}Sr{sub .16}Mn{sub .80}Co{sub .20}O{sub 3} cathodes are used. Both the apparent activation energies and the apparent pre-exponential factors of the overall electrochemical reaction are strongly influenced by the sintering temperature and the iron impurity content of the electrolyte.
- OSTI ID:
- 33607
- Report Number(s):
- CONF-940529--; ISBN 1-56677-080-7
- Country of Publication:
- United States
- Language:
- English
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