首页|A-site deficient Fe-based double perovskite oxides PrxBaFe2O5+δ as cathodes for solid oxide fuel cells
A-site deficient Fe-based double perovskite oxides PrxBaFe2O5+δ as cathodes for solid oxide fuel cells
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NSTL
Elsevier
? 2022 Elsevier B.V.In this work, Pr-deficiency is presented here as an effective strategy to promote the electrochemical properties of PrxBaFe2O5+δ (PrxBF, x = 1.00, 0.97, 0.93, 0.90) cathodes for solid oxide fuel cell (SOFC). The PrxBF cathode materials were prepared by a sol-gel method. The crystal structure results show that the PrxBF (x = 1.00) is double-perovskite phase with orthorhombic structure and the PrxBF (x = 0.97, 0.93, 0.90) is tetragonal perovskite structure. Introduction of Pr-deficiency in PrxBF oxides causes the decrease of oxygen content. The average TEC values (30–850 °C) for PrxBF are mainly concentrated between 15.29 and 15.95 × 10?6 K?1. In comparison to the parent PrBaFe2O5+δ oxides, the Pr-deficiency cathodes significantly enhance the electrochemical catalytic activity while maintain the lower thermal expansion coefficient. Among the series of PrxBF cathodes, the Pr0.93BF sample obtains the lowest polarization resistance. The fitted result of impedance spectra for Pr0.93BF cathode indicates that the charge transfer process in the high frequency plays a more dominant role in the oxygen reduction reaction. Furthermore, the Pr0.93BF electrode exhibits a good tolerance to CO2. The power density of an anode supported single cell with Pr0.93BF cathode achieved 967 mW cm?2 at 700 °C. Preliminary results suggest that PrxBF oxides are expected to be promising candidates for cathode in SOFC.
NSTL
Elsevier
