Abstract
The solid oxide fuel cell symmetrical cells with porous cathodes for intermediate temperature applications have been studied under electrochemical polarization and oxygen feeding conditions using high-temperature in situ XRD (HT-XRD) method. Changes in the lattice parameters of La0.6Sr0.4CoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ were observed depending on the temperature (T), electrode potential (E) and oxygen partial pressure (pO2) applied. At fixed T and pO2, the cathode potential noticeably influences the crystallographic cell volume calculated, thus, i.e., the oxygen stoichiometry, explained by the partial reduction of electrochemically labile Co-ionic centers in La0.6Sr0.4CoO3−δ (LSC), La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) and mechanically mixed cathodes La0.6Sr0.4CoO3−δ + La0.6Sr0.4Co0.2Fe0.8O3−δ (50:50 wt%) under study. Noticeably higher effect of cathode potential on the cell volume has been established at lower pO2. The dependence of crystallographic parameters obtained is in a good agreement with electrochemical impedance spectroscopy data, indicating that the electrocatalytic activity of cathode decreases with the rise of Fe ions concentration in LSCF.
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