High performance ferrite-based anode La0.5Sr0.5Fe0.9Mo0.1O3-δ for intermediate-temperature solid oxide fuel cell

A ferrite-based perovskite oxide La0.5Sr0.5Fe0.9Mo0.1O3-δ (LSFMo) has been evaluated as the anode of intermediate-temperature solid oxide fuel cell (IT-SOFC). XRD result indicates that no metallic iron precipitates from the lattice when the LSFMo was reduced under reducing atmosphere. The LSFMo exhibits a n-type semiconducting behavior in dry H2 and its conductivity values attain 2.5-6.8 S cm-1 at 600-850 °C. The polarization resistances (Rp) of LSFMo anode on La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) electrolyte are 9.08 Ω cm2 at 700 °C and 3.04 Ω cm2 at 800 °C in dry H2 under open-circuit condition; however, with introducing a Sm0.2Ce0.8O2-δ (SDC) interlayer between the anode and electrolyte, the Rp values are decreased to 1.54 Ω cm2 at 700 °C and 0.50 Ω cm2 at 800 °C. The maximum power densities (Pmax) of the LSGM supported single cell with configuration of LSFMo/SDC/LSGM/Ba0.6Sr0.4Co0.9Nb0.1O3-δ achieve 722 mW cm−2 in H2 and 513 mW cm−2 in CH4 at 800 °C. Moreover, good power cycle stability of the cell in CH4 means excellent carbon resistance of the LSFMo anode. The high electrochemical performance indicates that the LSFMo is a promising anode material for using in IT-SOFC.