A study of Pr0.7Sr0.3Fe1−xNixO3−δ as a cathode material for SOFCs with intermediate operating temperature

Pr0.7Sr0.3Fe1-xNixO3 delta (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 coneshaped electrodes on a Ce0.9Gd0.1O1.95 (CGO10) elec...

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Veröffentlicht in:Solid state ionics 2005-03, Vol.176 (11-12), p.1013-1020
Hauptverfasser: Hashimoto, Shin-ichi, Kammer, Kent, Larsen, Peter Halvor, Poulsen, Finn Willy, Mogensen, Mogens
Format: Artikel
Sprache:eng
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Zusammenfassung:Pr0.7Sr0.3Fe1-xNixO3 delta (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 coneshaped electrodes on a Ce0.9Gd0.1O1.95 (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 DGC 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 Rp.1. It is considered that the hysteresis was caused by relatively slow adjustment of the oxygen stoichiometry. The electrochemical performance Rp-1 of the PSFN compounds is similar to that of Lao. 6Sr0.4Fe0.sCo0.2O3-delta.
ISSN:0167-2738
DOI:10.1016/j.ssi.2004.09.010