Abstract
Polycrystalline perovskite oxide particles are promising candidates for cathode materials in solid oxide fuel cells. However, their limited activity and stability pose significant challenges for practical applications. In this study, we demonstrate a novel approach to achieve both high activity and durability in a PrBaCo2O5+δ catalyst through a simple epitaxial layer growth strategy. We found that an amorphous precursor of the highly durable catalyst SmBa0.5Ca0.5CoCuO5+δ can spontaneously adhere to the surface of PrBaCo2O5+δ particles. Upon heat treatment, it grows along the perovskite lattice, forming a heteroepitaxial layer with just a few atomic layers thickness. This heterostructure enhances the operational stability of PrBaCo2O5+δ transforming a 78% decrease over 100 h into a 7% increase. After 100 h, the power output density of the cell with the modified sample is more than 500% higher than that of unmodified PrBaCo2O5+δ. This work presents a new strategy for fabricating heteroepitaxial layers on polycrystalline ceramic catalysts and introduces a pioneering approach for developing high-performance oxygen reduction catalysts and related materials.
Published Version
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