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Electrochemical Behaviour of Ce 0.9 Gd 0.1 O 2−δ SOFC‐Anodes
Author(s) -
Störmer A. O.,
Holtappels P.,
Tu H. Y.,
Stimming U.
Publication year - 2002
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/1521-4052(200206)33:6<339::aid-mawe339>3.0.co;2-8
Subject(s) - chemistry , dielectric spectroscopy , anode , analytical chemistry (journal) , methane , electrochemistry , electrode , organic chemistry , chromatography
In order to compare the electrochemical performance of Ce 0.9 Gd 0.1 O 2−δ (CGO) in various fuels, impedance spectroscopy measurements were carried out in the atmospheres containing H 2 , CO, CO 2 , CH 4 , N 2 at various compositions, in the temperature range 650°C to 850°C. Ohmic loss and polarization resistance were derived from impedance spectroscopy measurements. The stability at different temperatures of the anode was also investigated in 9%H 2 /91%N 2 humidified with 3% H 2 O. The microstructure of the anode before and after degradation test was analysed by SEM. These investigations indicated similarities in the impedance and the activation enthalpies in hydrogen/water, methane/water and CO/CO 2 atmospheres. No indications of methane cracking leading to carbon formation were found.