TY - JOUR
T1 - Nano-sized Pr0.8Sr0.2Co1-xFe xO3powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes
AU - Magnone, Edoardo
AU - Traversa, Enrico
AU - Miyayama, Masaru
PY - 2010/4
Y1 - 2010/4
N2 - Different sets of perovskite-type oxides of general formula Pr 0.8Sr 0.2Co 1-xFe xO 3-δ (x=0.0, 0.2, 0.5, 0.8 and 1.0) were successfully prepared by low-cost single-step combustion synthesis at low temperatures based on the auto-ignition reaction of a nitrate solution in the presence of citric acid. Thermogravimetric and differential thermal analysis was carried out on nitrate-citrate precursors to determine the perovskite-phase formation process. The results revealed that the nitrate-citrate precursor exhibited self-propagating combustion behavior. Pr 0.8Sr 0.2Co 1-x Fe xO 3-δ powders showed an orthorhombic single-phase, with their unit cell volume increasing as a function of the Fe content (x). Scanning electron microscopy observations showed that the prepared powders were nanocrystalline. The Pr 0.8Sr 0.2Co 1-xFe xO 3-δ powders were characterized as fuel cell electrodes on Ce 0.8Sm 0.2O 2-δ pellets in symmetri-cal cells, and the electrochemical properties of the elec-trode/electrolyte interfaces were investigated using electrochemical impedance spectroscopy (EIS) as a func-tion of the temperature, Fe content (x) and oxygen partial pressure.
AB - Different sets of perovskite-type oxides of general formula Pr 0.8Sr 0.2Co 1-xFe xO 3-δ (x=0.0, 0.2, 0.5, 0.8 and 1.0) were successfully prepared by low-cost single-step combustion synthesis at low temperatures based on the auto-ignition reaction of a nitrate solution in the presence of citric acid. Thermogravimetric and differential thermal analysis was carried out on nitrate-citrate precursors to determine the perovskite-phase formation process. The results revealed that the nitrate-citrate precursor exhibited self-propagating combustion behavior. Pr 0.8Sr 0.2Co 1-x Fe xO 3-δ powders showed an orthorhombic single-phase, with their unit cell volume increasing as a function of the Fe content (x). Scanning electron microscopy observations showed that the prepared powders were nanocrystalline. The Pr 0.8Sr 0.2Co 1-xFe xO 3-δ powders were characterized as fuel cell electrodes on Ce 0.8Sm 0.2O 2-δ pellets in symmetri-cal cells, and the electrochemical properties of the elec-trode/electrolyte interfaces were investigated using electrochemical impedance spectroscopy (EIS) as a func-tion of the temperature, Fe content (x) and oxygen partial pressure.
KW - Combustion synthesis
KW - Effect of fe content
KW - Electrochemical characterization
KW - Nanomaterials
KW - Praseodymium
UR - http://www.scopus.com/inward/record.url?scp=77953286525&partnerID=8YFLogxK
U2 - 10.1007/s10832-009-9582-y
DO - 10.1007/s10832-009-9582-y
M3 - Article
AN - SCOPUS:77953286525
SN - 1385-3449
VL - 24
SP - 122
EP - 135
JO - Journal of Electroceramics
JF - Journal of Electroceramics
IS - 2
ER -