Porous layered La_0.6Sr_0.4Co_0.2Fe_0.8O₃ perovskite with enhanced catalytic activities for oxygen reduction

Abstract

Low-cost catalysts with high activity are in immediate demand for energy storage and conversion devices. In this study, polyvinyl pyrrolidone was used as a complexing agent to synthesize La_0.6Sr_0.4Co_0.2Fe_0.8O₃ (LSCF) perovskite oxide. The obtained porous layered LSCF has a large specific surface area of 23.74 m²/g, four times higher than that prepared by the traditional sol-gel method (5.08 m²/g). The oxygen reduction reaction activity of the oxide in 0.1 mol/L KOH solution was studied using a rotating ring-disk electrode. In the tests, the initial potential of 0.88 V (vs. reversible hydrogen electrode) and the limiting diffusion current density of 5.02 mA/cm² were obtained at 1600 r/min. Therefore, higher catalytic activity and stability were demonstrated, compared with the preparation of LSCF perovskite oxide by the traditional method.

Keywords

oxygen reduction reaction / electrocatalyst / perovskite / layered structure

References

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