Abstract
A series of A-site deficient Gd-containing Fe-Co-based cathodes were
synthesized using the glycine-nitrate process. All the compounds
consisted of two phases, i.e., a cubic and orthorhombic phase, as
determined by powder X-ray diffraction (XRD). The thermal expansion
coefficient decreased with increasing A-site deficiency, which could be
because cobalt was expelled from the main phases. Likewise, the
electrochemical activities of the Gd-containing Fe-Co-based solid oxide
fuel cell cathodes toward the reduction of oxygen ware improved by a
factor of approximately 3 by making them A-site deficient. The
composition (Gd0.6Sr0.4)0.85Fe0.8Co0.2O3–δ
showed the highest activity toward the reduction of oxygen among the
five compounds. Electrochemical impedance spectroscopy estimated the
area specific resistance as 5.77 Ω cm2 at 600 °C. The
electrochemical impedance spectroscopy measurements revealed three arcs
for most of the compounds at the three temperatures where the
measurements were performed.
Original language | English |
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Journal | Fuel Cells |
Volume | 18 |
Issue number | 1 |
Pages (from-to) | 96-100 |
ISSN | 1615-6846 |
DOIs | |
Publication status | Published - 2018 |