fig3

Figure 3. (A) SEM image of ZnSA-MNC; (B) The C_NO3^-, S_NH3, and FE_NH3 of ZnSA-MNC at different working potentials; (C) The NH₃ yield of ZnSA-MNC, ZnNP-MNC, and MNC at different working potentials. This figure is quoted with permission from Zhao et al.^[62]; (D) AC-HAADF-STEM image of Zr-TiON; (E) Stability of Zr-TiON. This figure is quoted with permission from Yang et al.^[63]; (F) HR-TEM image of NISA@BNG catalyst; (G) FE_NH3 using NG, BNG, NISA@NG, NISA@BNG as the catalyst. This figure is quoted with permission from Ajmal et al.^[64]; (H) High-resolution TEM and HAADF-STEM images of Co-CN and Co-CNP; (I) NH₄⁺-Faradic efficiency and NH₄⁺-yield rate using Co-CN and Co-CNP at different working potentials. This figure is quoted with permission from Li et al.^[65].