A highly stable of tungsten doped Pr_0.6Sr_0.4Fe_0.9W_0.1O_3-δ electrode for symmetric solid oxide fuel cells

In this work, a single perovskite Pr_0.6Sr_0.4Fe_0.9W_0.1O_3-δ (PSFW) for the electrode of SSOFCs is designed and successfully synthesized. The PSFW exhibits excellent structure stability in both reducing and oxidizing atmospheres and thermal compatibility with La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-δ (LSGM) electrolyte. The area specific polarization resistances (ASRs) of PSFW under oxidizing and reducing atmospheres are only 0.086 and 0.215 Ω cm² at 800 °C, respectively. The symmetric electrode shows excellent electro-catalytic activity toward oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR) and the corresponding impedance spectra under different hydrogen and oxygen partial pressures are further explored by distribution of relaxation times (DRT), which reveals that rate-limiting steps of HOR and ORR are the hydrogen adsorption/diffusion and oxygen diffusion, respectively. A LSGM electrolyte-supported cell with PSFW as symmetric electrodes displays the outstanding power density, considerable stability and reversibility, proving that the PSFW is a promising electrode material for symmetric solid oxide fuel cells.