2026-10-14T21:55:57Z https://www.scidb.cn/oai

10.57760/sciencedb.20982 2025-02-17T10:26:11Z

2025-02-17 FeSAC doi:10.57760/sciencedb.20982 en In this study, we introduce time-of-flight secondary ion mass spectrometry (ToF-SIMS) as a powerful and precise tool to identify the coordination structure of SACs. Using Fe SACs derived from biomass as a model system, we demonstrate that Fe adopts an Fe-N₂C₂ coordination rather than the commonly assumed Fe-N₄ configuration. Electron paramagnetic resonance (EPR) and Mössbauer spectroscopy further confirm the low-spin nature of this Fe-N₂C₂ structure. This unique coordination endows our Fe@CS-8.8 catalyst with outstanding oxygen reduction reaction (ORR) activity, achieving a half-wave potential of 0.91 V vs. RHE, surpassing the benchmark Pt/C catalyst.  FeC2N2; zinc-air battery; active site; single atom catalyst Jianan Su PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank