In
general, La1–x
Sr
x
MnO3 (LSM) has been commonly used as a
cathode for the commercial high-temperature solid oxide fuel cell
(SOFC), but it is better to develop a cathode with higher and longer
performance at high temperature (>900 °C). In this regard,
Fe-based
mixed ionic electronic conductors can be considered as one of the
potential candidates for the replacement of LSM in terms of excellent
catalytic activity. However, they suffer from performance degradation
due to the coarsening of particles during high-temperature fabrication
and operation. Herein, Ca- and Ni-doped Pr0.5Ba0.5FeO3−δ (PBF) is studied, where Ca doping
on Ba improves the electronic/ionic conductivity and Ni doping on
Fe further enhances the thermal stability. The optimal composition
of Pr0.5Ba0.3Ca0.2Fe0.7Ni0.3O3−δ (PBCFNi30) cathode shows a very low cathodic polarization resistance of 0.061
Ω cm2 with a small degradation rate of 0.086 ×
10–3 Ω cm2/h at 850 °C. Therefore,
PBCFNi30 can be considered as a promising cathode for commercial high-temperature
SOFC.
This report focuses on a study which measured the electrical conductivity of LSCrM, LSCr and LSM as a function of oxygen activity and temperature to evaluate the chemical and mechanical stability of the materials as an electrode in a solid oxide fuel-fed electrolyzer cell (SOFEC). The LSCrM symmetrical cell was fabricated using La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 (LSCrM) powder and evaluated using electrical conductivity, impedance spectroscopy, current density and power density as a function of temperature. During the evaluation, symmetrical cell tests and fuel cell tests were performed as a function of temperature. Silver (Ag) and platinum (Pt) were also used to compare the cell performance with and without precious metal as a current collector. Although the OCV was in the same level (about 1.2 V) in dry 10%H 2 -90%N 2 with both Ag and Pt collectors, the current density and power density of the cell was increased more than 20 times when Pt was used as a current collector.
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