fig7

Figure 7. (A) The atomic structures of FeN₄ with six single carbon vacancies. Reproduced with permission^[100]. Copyright 2023, John Wiley and Sons. (B) The free energy diagrams of ORR on FeN₄ with six single carbon vacancies. Reproduced with permission^[100]. Copyright 2023, John Wiley and Sons. (C) Variants of FeN₄ with different divacancy defect models. Reproduced with permission^[101]. Copyright 2022, Springer Nature. (D) Adsorption energy of O₂, O-O, and Fe-O bond length on FeN₄ with different divacancy structures. Reproduced with permission^[101]. Copyright 2022, Springer Nature. HOMO and LUMO distributions of the center-N-modified divacancies trapped Fe sites (E) and edge-N-modified divacancies trapped Fe sites (F) models. Reproduced with permission^[102]. Copyright 2020, John Wiley and Sons.