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Characterization of Sr 1– x Dy x CoO 3–δ ( x = 0.1, 0.2, 0.3) Cathode Materials for IT‐SOFCs
Author(s) -
Liu T.
Publication year - 2013
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.201300082
Subject(s) - tetragonal crystal system , cathode , materials science , microstructure , oxide , analytical chemistry (journal) , crystal structure , crystallography , solid oxide fuel cell , solid solution , electrolyte , chemistry , electrode , metallurgy , chromatography
The cobaltate perovskites Sr 1– x Dy x CoO 3–δ (SDCO, x = 0.1, 0.2, 0.3) materials were synthesized and evaluated as cathode for La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3–δ solid electrolyte supported intermediate‐temperature‐solid oxide fuel cells (IT‐SOFCs). The crystal structure of Sr 0.9 Dy 0.1 CoO 3–δ was defined in the cubic Pm –3 m space group (No. 221), Sr 0.8 Dy 0.2 CoO 3–δ and Sr 0.7 Dy 0.3 CoO 3–δ had a tetragonal I 4/ mmm structure. The electrical conductivities were all higher than 100 S cm –1 in the temperature of 170–800 °C. The polarization resistance ( R p ) and its activation energy ( E a ) increased with increasing x . SEM analysis confirmed the porous microstructure of the SDCO cathodes and good LSGM|LDC|SDCO adherence. Sr 0.9 Dy 0.1 CoO 3–δ exhibited the best cathode characteristics with a maximum test‐cell power density of 841 mW cm –2 , being a high potential candidate of cathode material for IT‐SOFCs.