Unraveling the Active Sites on Mesoporous CuFe₂O₄@N‐Carbon Catalysts with Abundant Oxygen Vacancies and M‐N‐C Content for Boosted Nitrogen Reduction Toward Electrosynthesis of Ammonia

Transition metal centers dispersed over nitrogen-doped carbon (M-NC) supports have been widely explored for electrocatalytic reactions; however, sparsely reported for electrochemical nitrogen reduction reaction (ENRR). Particularly, the single-atom catalysts (SACs) have shown reasonable ammonia yield rate and faradaic efficiency (FE), but their complex synthesis and low durability for long-term electrocatalysis runs restrict their use on a larger scale. Importantly, the catalytic active sites in metal nanostructured-based M-NC catalysts toward enhanced N