fig11

Figure 11. (A) TEM observation of Au₁/C₃N₄; (B) NH₄⁺ formation Faradaic efficiencies for Au₁/C₃N₄, AuNPs/C₃N₄, pure C₃N₄ and Au₁/C₃N₄; (C) NH₄⁺ yield rates normalized by Au mass^[114]. Copyright 2023, Elsevier; (D) HAADF-STEM images of Au-SA/FeOOH; (E) NH₃ yields for Au-SA/FeOOH and β-FeOOH^[115]. Copyright 2023, Springer Nature; (F) The free energy for H and N₂ adsorption on these five selected candidates; (G) The calculated free energy profiles for NRR through enzymatic mechanism on Mo-Ru; (H) Projected crystal orbitals and (I) d-band centers of Ru and Mo-Ru dual-sit^[117]. Copyright 2023, Elsevier; (J) Computed electronic properties and (K) FE for Pd/NC, Cu/NC, and PdCu/NC; (L) ¹H spectra of electrolyte after 2 h of electrochemical reduction on PdCu/NC using Ar, ¹⁴N₂ and ¹⁵N₂ as the feeding gases. TEM: Transmission electron microscopy; HAADF-STEM: high-angle annular dark field scanning transmission electron microscopy; NRR: nitrogen reduction reaction; FE: Faradic efficiency.