fig9

Figure 9. (A) Single atom: Schematic illustration of the synthesis of Fe SAC; NH₃ yield rate and partial current density of Fe SAC, FeNP/NC, and NC^[66]; (B) Alloy: Catalytic conversion steps from NO₃^- to NH₃ on Fe-Cu alloy; NH₃ yield rate of Fe/Cu-HNG, Fe-HNG, Cu-HNG^[67]; (C) Heteroatom: Schematic illustration of the synthesis of BDCu; Comparison of properties of BDCu and ZnCu_xO_1+x at different potentials^[68]. FeNP/NC: Fe nanoparticles in the N-doped carbon matrix; HNG: holey edge sites of nitrogen-dopedgraphene.