Abstract
K 2NiF 4 structured La 2Co 0.8Ni 0.2O 4 + δ is an oxygen overstoichiometric oxide with high oxygen diffusion and oxygen surface exchange coefficients at temperature range 450–800 °C. In this work, composites consisting of La 2 − x Sr x Co 0.8Ni 0.2O 4 + δ (LSCN, x = 0, 0.4, 0.8, 1.2, 1.6) and Ce 0.9Gd 0.1O 1.95 (GDC) have been investigated as the cathodes for low-and-intermediate temperature solid oxide fuel cells (SOFCs). AC impedance spectroscopy on symmetric cells indicated that among the series of LSCN–GDC composites, La 1.2Sr 0.8Co 0.8Ni 0.2O 4 + δ -based electrode had the lowest interfacial polarization resistance, which was 1.36 Ω cm 2 at 600 °C when the electrode was not activated. Significant activation effect was observed with a single cell when current treatment was performed at 200 mA cm − 2 within 30 min. The single cell with La 1.2Sr 0.8Co 0.8Ni 0.2O 4 + δ –GDC as the cathode generated power density up to 350 mW cm − 2 at 600 °C. In addition, the performance was pretty stable when a constant output voltage of 0.5 V was set for 36 h. These results suggest that La 2 − x Sr x Co 0.8Ni 0.2O 4 + δ could be promising materials as the cathodes for SOFCs that operated at low-and-intermediate temperatures.
Published Version
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