| 초록 |
Efficient and sustainable oxygen reduction reaction (ORR) catalysts have been required to replace commercial platinum-based catalysts in many energy conversion/storage system including metal-air batteries and fuel cells. Fe-based catalysts have captured attention due to its high activity and availability. However, the role of two active sites, Fe-N bonding and Fe covered with carbon layer (Fe@C), in Fe-based catalysts were ambiguous due to the difficulty in controlling these active sites during synthesis. In this study, Fe-N-C electrocatalysts were prepared using pyrosynthesis and controlling the Fe/C ratio, resulting in adequate Fe-N/Fe@C ratio. In single cell test of Zn-air batteries and anion exchange membrane fuel cells, the Fe-N-C electrocatalysts exhibit excellent performance, based on its superior ORR activity when compared to the previously reported transition metal-based catalysts. This work provides efficient strategies to design high-performance catalysts for ORR. |
