NPM-SACs/CS for NRR. (A) An illustration of SA-Mo/NPC and its corresponding atomic structure model. (B) NH₃ yield rate (red) and FE (blue) at each given potential. Reproduced with permission from ref. [238]. Copyright©2019, John Wiley and Sons. (C) Linear sweep voltammograms of single-atom dispersed Fe-N-C (Fe SA-N-C) and nitrogen-doped carbon (N-C) in Ar-saturated (dashed line) or N₂-saturated (solid line) 0.1 mol L⁻¹ KOH solution with a scan rate of 50 mV s⁻¹. (D) NH₃ Faradaic efficiencies and mass-normalized yield rates at each given potential of Fe SA-N-C. (E) N¹⁵ isotope labeling experiment. Reproduced with permission from ref. [240]. Copyright©2019, Springer Nature.