Abstract
Iron-based atomic single-site catalysts are a type of promising catalyst for oxygen reduction reactions. However, these catalysts are still faced with challenges such as insufficient catalytic activity and poor stability. Fe clusters and Fe single atoms were simultaneously loaded on porous carbon using chemical vapor deposition in this study. The aim is to induce the redistribution of electronic clouds on Fe single-atom sites through Fe clusters, improving their adsorption capacity for oxygen reduction reaction intermediates, and thus obtaining highly active catalysts for oxygen reduction reaction. Under alkaline conditions, the ORR activity of FeSA/FeAC@NC (half-wave potential E1/2 of 0.90 VRHE) was significantly higher than that of commercial Pt/C (0.87 VRHE) and FeSA@NC (0.87 VRHE). Furthermore, FeSA/FeAC@NC exhibited exceptional durability, with 97.5% current retention in the i-t stability test for 10,000s. Additionally, the zinc-air battery assembled with FeSA/FeAC@NC showed a power density of 225 mW cm-2 and an energy density of 1082.2 Wh kgZn-1, demonstrating considerable potential for practical applications.
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