fig5

Figure 5. (A) Schematic image of the synthesis process for Cu/CuO_x/CF. (B) NH₃ yield rates and FEs of Cu/CuO_x/CF at different potentials. (C) NH₃ yield rates and FEs of Cu/CuO_x/CF, CuO_x/CF, Cu/CF, and CF. (D) The Cu/CuOx/CF recycling test was at -1.3 V (vs. SCE). (A-D) Figures are reprinted with permission from Ref.^[60]. Copyright 2022 American Chemical Society^[60]. (E) SEM images of CO₃O₄/Co-h. (F) Calculated adsorption energies of NO₃^- on various Co₃O₄ models. (G) Computed Gibbs free energies of H₂ production. (H) The NH₃ yield rate of Co₃O₄/Co-l and Co₃O₄/Co-h at different potentials. (E-H) Figures are reprinted with permission from Ref.^[61]. Copyright 2023 Elsevier^[61].