Titanium-substituted lanthanum strontium ferrite as a novel electrode material for symmetrical solid oxide fuel cell

In this study, La0.3Sr0.7Ti0.3Fe0.7O3-δ (LSTF) is evaluated as a novel symmetrical electrode on SDC(Sm0.2Ce0.8O1.9)-YSZ(yttria-stabilized zirconia)-SDC three-layer electrolyte. Impedance spectroscopy results indicate the polarization resistances of anode and cathode are 0.18 and 0.04 Ω cm2 at 900 °C, respectively, suggesting that the micron-scale LSTF possesses high electrocatalytical activity for both oxygen reduction and hydrogen fuel oxidation reactions. A single cell consisting of LSTF symmetrical electrode and YSZ electrolyte support (∼400 μm) shows a maximum power density (MPD) of 374 mW cm−2 at 900 °C using wet H2 as fuel. Furthermore, the LSTF electrode shows good short-term stability in wet H2 at 800 °C and reliable redox stability during the repeated redox cycles. The present results indicate that the La0.3Sr0.7Ti0.3Fe0.7O3-δ is a promising electrode material for symmetrical SOFCs.