fig9

Figure 9. (A) Schematic of Fe SAC-MIL101-T and (B) aberration-corrected HAADF-STEM image of Fe SAC-MIL101-1000 (A and B reproduced with permission from Wiley-VCH, copyright 2021)^[151]; (C) synthesis of the Fe SAC-MOF-5 catalyst; (D) wavelet-transformed k²-weighted EXAFS spectra of Fe SAC-MOF-5, FePc, and Fe foil (C and D reproduced with permission from Wiley-VCH, copyright 2021)^[152]; (E) Synthetic scheme of FeSAs-UNCNS; (F) LSV curves recorded in an O₂-saturated 0.1 M KOH solution at a rotation speed of 1,600 rpm and a sweep rate of 10 mV s^-1; (G) polarization and power density curves of primary and simulated seawater-based Zn-air batteries (ZABs); (H) galvanostatic charge-discharge cycling curves of rechargeable ZABs at a current density of 5 mA cm^-2 (reproduced with permission from Wiley-VCH, copyright 2024)^[134]. HAADF-STEM: High-angle annular dark field-scanning transmission electron microscopy; EXAFS: extended X-ray absorption fine structure; SAC: single-atom catalyst; MIL: materials research institute lavoisier; MOF: metal-organic framework; UNCNS: ultrathin nitrogen-doped carbon nanosheets; LSV: linear sweep voltammetry.