Abstract
Co-free La0.6Sr0.4FeO3-δ (LSFNb0) and La0.6Sr0.4Fe0.9Nb0.1O3-δ (LSFNb0.1) perovskite oxides were prepared by a standard solid-state reaction method. The structural stability and electrochemical performance of La0.6Sr0.4Fe0.9Nb0.1O3-δ as both cathode and anode were studied. Nb dopant in LSFNb0 significantly enhances the structural and chemical stability in anode condition. At 800 °C, the polarization resistances (Rp) of LSFNb0.1 symmetric electrode based on YSZ electrolyte are 0.5 and 0.05 Ω cm2 in H2 and air, respectively. The peak power densities of LSFNb0.1 based on LSGM electrolyte-supported SSOFCs are 934 and 707 mW cm−2 at 850 °C in H2 (3% H2O) and dry CO, respectively. Moreover, the symmetric cell exhibits reasonable stability in both H2 and CO fuel, suggesting that La0.6Sr0.4Fe0.9Nb0.1O3-δ may be a potential symmetric electrode material for hydrogen and carbon monoxide SOFCs.
Published Version
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