Publication date: 10th April 2024
The surface area is a critical region for determining oxygen reduction reactions (ORRs) on the cathode in the design of advanced proton-conducting solid oxide fuel cells (H-SOFCs) systems. The particle surface of Sr-containing perovskite is fully covered with Sr segregation, as confirmed by low-energy ionic scattering (LEIS). The Sr segregation layer exhibits poor electronic and ionic conductivity, thereby obstructing ionic conductivity between particles. To enhance surface performance, impregnation was employed to promote catalysis and conductivity at a low cost. Specifically, (001)-oriented Co3O4 was carefully selected and prepared due to its excellent ORR catalysis performance, while (001) was chosen for its lattice constant match. Transmission electron microscopy (TEM) analysis confirmed that Co3O4 adheres well to La0.5Sr0.5FeO3 (LSF), and TEM-energy dispersive x-ray spectroscopy (EDS) revealed inter-diffusion of Fe and Co with a smaller band gap and a strong ability for oxygen vacancy formation, as supported by density functional theory (DFT) calculations. A significant improvement in power density was observed in a single-cell test.
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