Abstract
Stabilizing SrFeO3-δ in cubic structure is of great significance for its application in solid oxide fuel cells. Herein, a rational way is reported to tune the structure and performance of SrFeO3-δ perovskite as oxygen reduction electrodes by embedding aluminum cation in B-site. Compared with their parent oxide, the obtained stabilized cubic perovskites SrFe1-xAlxO3-δ (x = 0.1 and 0.2) show much improved electrocatalytic activity, achieving area specific resistance values of 0.57, 0.15 and 0.34 Ωcm2 at 700 °C in air for SrFeO3-δ, SrFe0.9Al0.1O3-δ and SrFe0.8Al0.2O3-δ, respectively. Such improved performance is a result of the exceeding 2-fold increase in oxygen chemical bulk diffusion and surface exchange kinetics due to Al3+ doping. Moreover, favorable CO2-resistance is also demonstrated. DFT calculations are carried out to reveal the accelerated oxygen reduction reaction and enhanced CO2 tolerance. This work indicates an aluminum dopant in B-site may provide a highly attractive strategy for the future development of cathode materials.
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