Precise Control of Oxygen Coordination Number in Iron-Phenolic Networks for Enhanced Oxygen Evolution Reaction Catalysis

Le résumé fourni par la source

The local structure of single metal sites is critical for optimizing catalytic activity, yet their precise control of coordination number remains a significant challenge. This study demonstrates that the coordination environment of iron (Fe) in metal-phenolic networks (MPNs) can be systematically tuned with oxygen coordination numbers of 2, 4, and 6 by adjusting pH during synthesis. Electrochemical tests reveal that Fe-2O exhibits superior oxygen evolution reaction (OER) performance, achieving a low overpotential of 270 mV at 10 mA cm⁻², a Tafel slope of 66.82 mV dec⁻¹, and excellent stability over 27 hours. In contrast, Fe-4O and Fe-6O show progressively higher overpotentials and reduced stability, with Fe-6O performing nearly as poorly as bare nickel foam. The low oxygen coordination of Fe can facilitate efficient charge transfer and enhance OER activity. This work highlights the importance of tailoring the coordination environment of single metal sites to optimize catalytic performance.

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