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• W4205125571 abstract "Abstract New Sr 0.5 Bi 0.5 FeO 3‐ δ (SBF) and Sr 0.5 Bi 0.45 FeO 3‐ δ (SB0.45F) oxides are systematically investigated as oxygen reduction cathodes for intermediate temperature solid oxide fuel cells. The SBF and SB0.45F samples have been discovered that form single‐phase solid solutions while maintaining outstanding chemical stability with gadolinium‐doped ceria (Gd 0.1 Ce 0.9 O 1.95 , GDC) even sintering at 1000 °C in air. The average thermal expansion coefficients (TECs) for SBF and SB0.45F are very similar to the electrolyte of GDC. XPS and iodometric titration results reveal that A‐site deficient SB0.45F cathode possesses a high oxygen vacancy concentration, which can greatly enhance the electrochemical performance of porous cathode. A low polarization resistance ( R p ) is shown for the SB0.45F cathode based on a symmetrical cell test, obtained by electrochemical impedance spectroscopy (EIS). Additionally, the deconvolution results of the EIS test display that the ORR rate of the SB0.45F cathode should be jointly limited by the charge transfer processes and oxygen adsorption processes. The peak power output of a single solid oxide fuel cell (SOFC) equipped with the SB0.45F cathode reaches 0.77 W cm −2 at 700 °C, about 1.75 times of SBF. These findings suggest that the Bi‐deficient SB0.45F perovskite oxide is an outstanding catalyst for IT‐SOFC." @default.
• W4205125571 created "2022-01-25" @default.
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• W4205125571 date "2022-01-12" @default.
• W4205125571 modified "2023-10-17" @default.
• W4205125571 title "Highly Improved Electrochemical Performance of a Fe‐based Cathode by Introducing A‐site Cationic Deficiencies" @default.
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• W4205125571 doi "https://doi.org/10.1002/slct.202103849" @default.
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