LSM-infiltrated LSCF cathodes for solid oxide fuel cells

摘要

Mixed ionic-electronic conductors in the family of LaxSr1-x CoyFe1-yO3-δ have been widely studied as cathode materials for solid oxide fuel cells (SOFCs).However,the long-term stability was a concern.Here we report our findings on the effect of a thin film coating of La0.85Sr0.15 MnO3-δ (LSM) on the performance of a porous La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ (LSCF) cathode.When the thicknesses of the LSM coatings are appropriate,an LSM-coated LSCF electrode showed better stability and lower polarization (or higher activity) than the blank LSCF cathode without LSM infiltration.An anode-supported cell with an LSM-infiltrated LSCF cathode demonstrated at 825℃ a peak power density of ～1.07 W/cm 2,about 24% higher than that of the same cell without LSM infiltration (～0.86 W/cm 2).Further,the LSM coating enhanced the stability of the electrode;there was little degradation in performance for the cell with an LSM-infiltrated LSCF cathode during 100 h operation.