Spatial engineering and d-orbital coupling in axial dual-atom sites for bifunctional oxygen catalysis.

ABSTRACT: Heterogeneous dual-atom catalysts (DACs) offer great potential to enhance electrocatalytic reaction kinetics and provide diverse active sites. However, achieving precise tuning of metal atom coordination in DACs remains a significant challenge. Here, the axial dual atom (ADA) embedded within a covalent organic framework and N-doped graphene, features an axial intermetallic distance tuned by alcohol solvent treatment, resulting in efficient bifunctional electrocatalysis of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In situ X-ray absorption near-edge spectroscopy (XANES) and Raman spectroscopy reveal that Fe acts as the primary active center in the axially coordinated FeCo-ADA, with Co providing synergistic effects. The in-depth theoretical analysis elucidates that

SUBMITTER: Yan X 

PROVIDER: S-EPMC12728212 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature