Fe/Co dual metal catalysts modulated by S-ligands for efficient acidic oxygen reduction in PEMFC.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37294763.
- Also identified by DOI 10.1126/sciadv.adg0366 and PMC identifier 10256161.
- Licence recorded as CC BY-NC.
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Abstract
Here, we report a conceptual strategy for introducing spatial sulfur (S)-bridge ligands to regulate the coordination environment of Fe-Co-N dual-metal centers (Spa-S-Fe,Co/NC). Benefiting from the electronic modulation, Spa-S-Fe,Co/NC catalyst showed remarkably enhanced oxygen reduction reaction (ORR) performance with a half-wave potential (<i>E</i><sub>1/2</sub>) of 0.846 V and satisfactory long-term durability in acidic electrolyte. Combined experimental and theoretical studies revealed that the excellent acidic ORR activity with a remarkable stability observed for Spa-S-Fe,Co/NC is attributable to the optimal adsorption-desorption of ORR oxygenated intermediates achieved through charge-modulation of Fe-Co-N bimetallic centers by the spatial S-bridge ligands. These findings provide a unique perspective to regulate the local coordination environment of catalysts with dual-metal-centers to optimize their electrocatalytic performance.