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Abstract
This paper presents layered perovskite LaxSr2−xFeO4 electrodes with La0.9Sr0.1Ga0.8Mg0.2O3−δ (LSGM) electrolyte for symmetrical solid oxide fuel cells. XRD and TGA results reveal a good stability of La0.8Sr1.2FeO4 electrode in reducing atmosphere. An excellent chemical compatibility in air and 5% H2/Ar was found between La0.8Sr1.2FeO4 electrode and LSGM electrolyte. In air, the maximum conductivity of these materials occurred as x = 0.6, however, La0.8Sr1.2FeO4 sample has the highest conductivity in 5% H2/Ar. The electrochemical properties were evaluated by impedance spectroscopy and current–voltage curves. At 800 °C, the polarization resistance of the La0.8Sr1.2FeO4 cathode is about 1.85 Ω cm2 in air, while the polarization resistance of the La0.8Sr1.2FeO4 anode is about 5.82 Ω cm2 under 5% H2/Ar. A single cell (1.0 cm2 active area) was fabricated with 70wt% La0.8Sr1.2FeO4+30wt% LSGM as both cathode and anode, LSGM (1.1 mm thickness) as electrolyte. At 800 °C, the maximum power density was 73 mW cm−2 under humidified H2 as fuel.
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