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Performance Improvement of an Inhomogeneous Cathode by Infiltration
Author(s) -
SeyedVakili S. V.,
Graves C. R.,
Babaei A.,
HeshmatiManesh S.,
Mogensen M. B.
Publication year - 2017
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201600115
Subject(s) - materials science , cathode , calcination , microstructure , infiltration (hvac) , electrode , electrochemistry , polarization (electrochemistry) , open circuit voltage , composite number , composite material , solid oxide fuel cell , porosity , oxide , dielectric spectroscopy , analytical chemistry (journal) , anode , voltage , metallurgy , chemistry , catalysis , electrical engineering , chromatography , biochemistry , engineering
The performance of solid oxide fuel cells (SOFCs) is considerably influenced by the microstructure and chemical composition of cathode materials. Porous La 0.85 Sr 0.15 FeO 3 –Ce 0.9 Gd 0.1 O 2 composite electrodes were infiltrated by La 0.6 Sr 0.4 CoO 3 and La 0.6 Sr 0.4 FeO 3 . The effects of infiltration loading, calcination temperature of infiltrated material and co‐infiltration of LSC and LSF were investigated using electrochemical impedance measurement, microstructural analysis, and high‐temperature X‐ray diffraction (HT‐XRD). A symmetrical cell two‐electrode configuration was used to examine the electrochemical performance of the electrodes. The electrochemical results revealed that the polarization resistance of the cathodes significantly was decreased by infiltration from 2.59 to 0.034 Ω cm 2 measured at 670 °C. The best electrode performance was achieved at a calcination temperature of 770 °C. It was also found that infiltration of LSC improved the stability of the electrodes during 145 h of testing at 620 °C in air at open circuit voltage (OCV).