fig13

Figure 13. (A) Illustration of SA-Mo/NPC and atomic structure model; (B) NH₃ yield rate (red) and FE (blue) at each given potential of SA-Mo/NPC^[134]. Copyright 2023, Wiley; (C) SEM image of MoSAs-Mo₂C/NCNTs; The (D) NRR and (E) HER Gibbs free energy diagrams on the MoNC₂ SAC and Mo₂C (101) surface; (F) NH₃ yield rate and FE of MoSAs-Mo₂C/NCNTs, MoSAs/NCNTs and Mo₂C/NCNTs^[137]. Copyright 2023, Wiley; (G) FT of the EXAFS spectra at the k3-weighted Kedges and fitting of FT EXAFS spectra of Mo/BCN^[140]. Copyright 2023, ACS Publications; (H) HRTEM images of the Mo-HNG catalyst; (I) HAADF-STEM images of Mo-HNG and magnified area with circled individual Mo atoms immobilized on the carbon matrix presumably at N-rich edges; (J) Synthesis and morphological characterization of the Mo/HNG catalyst and (K) Potential dependent FEs and partial current densities of NH₃ for NRR on Mo/HNG, Mo/NG, 2Mo/HNG catalysts^[141]. Copyright 2023, Wiley. SA: Single atom; NPC: nitrogen doped porous carbon; FE: Faradic efficiency; SEM: scanning electron microscopy; NCNTs: N-doped carbon nanotubes; NRR: nitrogen reduction reaction; HER: hydrogen evolution reaction; SAC: single atom electrocatalyst; EXAFS: extended X-ray absorption fine structure; Mo/BCN: B and N co-doped Mo SACs; HAADF-STEM: high-angle annular dark field scanning transmission electron microscopy.