TY - JOUR
T1 - A study of Pr0.7Sr0.3Fe1-xNi xO3-δ as a cathode material for SOFCs with intermediate operating temperature
AU - Hashimoto, Shin Ichi
AU - Kammer, Kent
AU - Larsen, Peter Halvor
AU - Poulsen, Finn Willy
AU - Mogensen, Mogens
N1 - Funding Information:
This work was supported by the Danish Energy Agency, contract no. 1443/02-0001 EFP 2002 DK-SOFC b, long term R&D. The help from all in the SOFC group at Risø is appreciated.
PY - 2005/3/31
Y1 - 2005/3/31
N2 - Pr0.7Sr0.3Fe1-xNixO 3-δ(PSFN; x=0.2-0.5) compounds were synthesized and characterized by powder X-ray diffraction (XRD), thermal expansion coefficient (TEC) measurements, electrical conductivity and electrochemical impedance spectroscopy on cone-shaped electrodes on a Ce0.9Gd 0.1O1.95 (CGO10) electrolyte. The main phase of the powders belongs to the orthorhombic crystal system. The conductivities are fairly high, e.g., around 450 Scm-1 at 600 °C for the x=0.3 compound. The TEC of the compounds is close to the values of ceria-based electrolytes. PSFN showed hysteresis in the temperature dependence of the conductivity, TEC and area-specific polarization resistance Rpol. It is considered that the hysteresis was caused by relatively slow adjustment of the oxygen stoichiometry. The electrochemical performance Rpol -1 of the PSFN compounds is similar to that of La 0.6Sr0.4Fe0.8Co0.2O 3-δ.
AB - Pr0.7Sr0.3Fe1-xNixO 3-δ(PSFN; x=0.2-0.5) compounds were synthesized and characterized by powder X-ray diffraction (XRD), thermal expansion coefficient (TEC) measurements, electrical conductivity and electrochemical impedance spectroscopy on cone-shaped electrodes on a Ce0.9Gd 0.1O1.95 (CGO10) electrolyte. The main phase of the powders belongs to the orthorhombic crystal system. The conductivities are fairly high, e.g., around 450 Scm-1 at 600 °C for the x=0.3 compound. The TEC of the compounds is close to the values of ceria-based electrolytes. PSFN showed hysteresis in the temperature dependence of the conductivity, TEC and area-specific polarization resistance Rpol. It is considered that the hysteresis was caused by relatively slow adjustment of the oxygen stoichiometry. The electrochemical performance Rpol -1 of the PSFN compounds is similar to that of La 0.6Sr0.4Fe0.8Co0.2O 3-δ.
KW - Cathode
KW - Conductivity
KW - Perovskite
KW - Point electrode
KW - Thermal expansion coefficient
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U2 - 10.1016/j.ssi.2004.09.010
DO - 10.1016/j.ssi.2004.09.010
M3 - Article
AN - SCOPUS:15944420844
VL - 176
SP - 1013
EP - 1020
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 11-12
ER -