fig8

Figure 8. (A) Schematic illustration of synthetic procedure for gas diffusion strategy. (B) Optimized atomic structures for *CO and *COOH intermediates absorbed on FeN₄, FeN₃ and FeN₃V models. Yellow, blue, grey and red balls represent Fe, N, C and O atoms, respectively. (C) Calculated free-energy diagrams for CO₂ER pathway of FeN₄, FeN₃ and FeN₃V moieties. Reproduced with permission: Copyright 2020, Wiley^[17]. (D) FT-EXAFS fitting results of Cu-N₂/GN. (E) DFT-based free-energy profile for the optimized Cu-N₂ and Cu-N₄ models during the CO₂ER. (F) Geometric surface area-normalized partial current density for CO production of different catalysts. Reproduced with permission: Copyright 2019, Wiley^[128].