fig10

Figure 10. (A) Atomic-resolution STEM images of Fe-ISA/N, S-HG. (B) Spin density distribution of edged “FeN₄” moiety in the carbon skeleton. (C) Adsorption energy of *CO (∆G*CO) as a function of the overpotential (η_Charge-η_Disharge) on the above catalysts. Reproduced with permission: Copyright 2020, Wiley^[135]. (D) XANES spectra at the Co K-edge of SA Co/GO, adjacent Co/GO, Co₃O₄, CoO and Co foil. (E) Fourier transforms of Co K-edge of SA Co/GO, adjacent Co/GO, Co₃O₄, CoO and Co foil. (F) HAADF-STEM image of adjacent Co from adjacent Co/GO. (g) Side views and (h) charge density differences of Li₂CO₃ adsorbed on graphene oxide, single cobalt atom and dimer cobalt, respectively. Purple, green, gray and red balls represent Co, Li, C and O, respectively. Reproduced with permission: Copyright 2019, Wiley^[136].