| 초록 |
Fuel cell is one of the most promising next-generation energy conversion devices, which has high energy density and energy conversion efficiency with lower pollutant emissions. Because the oxygen reduction reaction (ORR) is the main reaction to enhance fuel cell efficiency, the research of non-noble materials to boost ORR efficiency has garnered growing attention. The Fe and Co dual-site single-atom catalysts with Fe-Nx and Co-Nx active sites are exceedingly promising alternatives to platinum-based catalysts for ORR. In this study, we synthesized the FeCo-NC-PPy catalysts by carbonizing metal-organic frameworks with conductive polymers (polypyrrole). After carbonization, the aromatic characteristics of the pyrrole ring encourage the creation of a graphite carbon structure and contribute in the coordination of Fe and Co ions in zeolitic imidazolate frameworks to a single atom active site, which dramatically boosts ORR activity. The FeCo-NC-PPy demonstrated superior ORR performance (E1/2 of 0.91 V vs. RHE) and durability (unchanged after 5000 cycles) to commercial Pt/C. |
