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Overcoming the sluggish activity of cathode materials is critical to realizing the wide‐spread application of intermediate‐temperature solid oxide fuel cells. Herein, a new way is reported to tune the performance of perovskite‐type materials as oxygen reduction electrodes by embedding anions (F − ) in oxygen sites. The obtained perovskite oxyfluorides SrFeO 3− σ − δ F σ and SrFe 0.9 Ti 0.1 O 3− σ − δ F σ (σ = 0.05 and 0.10) show improved electrocatalytic activity compared to their parent oxides, achieving area specific resistance values of 0.875, 0.393, and 0.491 Ω cm 2 for SrFeO 3− δ , SrFeO 2.95− δ F 0.05 , and SrFeO 2.90− δ F 0.10 , respectively, at 600 °C in air. Such improved performance is a result of the improved bulk diffusion and surface exchange properties due to anion doping. Moreover, favorable stability in performance is also demonstrated for the F − anion‐doped perovskites as oxygen reduction electrodes at 650 °C for a test period of ≈200 h. A combination of anion doping and cation doping may provide a highly attractive strategy for the future development of cathode materials.
Zhang et al. (Tue,) studied this question.