A novel cobalt–free La0.5Ba0.5Fe0.95Mo0.05O3–δ electrode for symmetric solid oxide fuel cell. Issue 12 (September 2020) - Cai, Hongdong
Highlights: LBFMo was evaluated as electrode of symmetric SOFC (S-SOFC). Ba and Mo co-doping succeeds in stabilizing the cubic structure of the LaFeO3-δ phase. Excellent electrochemical performance for the S-SOFC with LBFMo electrode was obtained. Good stability for the S-SOFC with LBFMo electrode was determined. Abstract: Cobalt − free perovskite oxide La0.5 Ba0.5 Fe0.95 Mo0.05 O3− δ (LBFMo) was investigated as the electrode of symmetric solid oxide fuel cell (S − SOFC) based on 300−um − thick La0.9 Sr0.1 Ga0.8 Mg0.2 O3− δ (LSGM) electrolyte. The electrochemical performance of the S − SOFC with LBFMo|LSGM|LBFMo configuration was evaluated using ambient air as oxidant and H2 as fuel. The maximum power density ( P max ) of the S − SOFC achieves as high as 0.96 W cm −2 at 800 °C; meanwhile, the total polarization resistance ( R pt ) of the S − SOFC (including the contributions of both cathode and anode) is only ∼0.12 Ω cm 2 . Impedance spectra analysis indicates the polarization associated with anode plays a more rate − limiting role in the whole electrochemical reaction process of the S − SOFC. In addition, using LBFMo as symmetric electrode, the S − SOFC also exhibits good cell stability. All results indicate that the LBFMo is a very potential candidate for S − SOFC electrode.