Science Advances

Supplementary Materials

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  • Supplementary Materials and Methods
  • Fig. S1. TEM images (associated with elemental mapping) of pfSAC, showing the existence and homogeneous distribution of C, Fe and N.
  • Fig. S2. TEM images (associated with elemental mapping) of pure graphene, in which no Fe and N was observed.
  • Fig. S3. XPS spectra and high-resolution XPS spectra of pfSAC-Fe-0.2.
  • Fig. S4. HAADF-STEM images of the pfSAC-Fe-0.2 sample.
  • Fig. S5. Fe K-edge EXAFS analysis of the Fe foil.
  • Fig. S6. Fe K-edge EXAFS analysis of pure COFBTC.
  • Fig. S7. Fe K-edge EXAFS analysis of pfSAC-Fe-0.2.
  • Fig. S8. Relaxed structures for top-vertical absorption sites.
  • Fig. S9. Relaxed structures for top-horizontal absorption sites.
  • Fig. S10. Relaxed structures for bridge-horizontal absorption sites.
  • Fig. S11. Relaxed structures for bridge-vertical absorption sites.
  • Fig. S12. DOS for pfSAC-Fe and COFBTC.
  • Fig. S13. The RRDE test using different pfSAC-Fe-0.2 loadings (from 40 to 304 μg cm−2) in 0.1 M KOH.
  • Fig. S14. Stability tests for pfSAC-Fe-0.2.
  • Fig. S15. The Fe K-edge XANES spectra of pfSAC-Fe-0.2 before and after ORR.
  • Fig. S16. TEM images (associated with elemental mapping) of the pfSAC-0.2 sample after 6000 cycles of CV test, showing the homogeneous distribution of C, Fe, and N.
  • Fig. S17. HAADF-STEM images of the pfSAC-Fe-0.2 sample after 6000 cycles of CV test.
  • Fig. S18. CVs, H2O2 yields, and electron transfer number of pfSAC-Fe-0.01, pfSAC-Fe-0.05, pfSAC-Fe-0.1, and pfSAC-Fe-0.2.
  • Fig. S19. LSV curves of graphene, pfSAC-Fe-0.2, and 20% Pt/C in O2-saturated 0.1 M KOH solution at a scan rate of 5 mV s−1 and a rotation speed of 1600 rpm.
  • Fig. S20. Kinetic current density of pfSAC-Fe-0.01, pfSAC-Fe-0.05, pfSAC-Fe-0.1, pfSAC-Fe-0.2, Pt/C, and graphene over 0.82–1.0 V versus RHE.
  • Fig. S21. LSV curves and the corresponding K-L plots of pfSAC-Fe-0.01, pfSAC-Fe-0.05, and pfSAC-Fe-0.1.
  • Fig. S22. Tafel plot and methanol crossover tests of the samples.
  • Fig. S23. Polarization and power density curves of assembled Zn-air batteries using Pt/C and pfSAC-Fe-0.2 as ORR catalysts with different loading masses.
  • Table S1. Fe K-edge EXAFS curve fitting parameters.
  • Table S2. Comparison of the ORR activity between pfSAC-Fe-0.2 and other nonprecious catalysts under basic conditions (0.1 M KOH) in literature.
  • Table S3. Inductively coupled plasma atomic emission spectroscopy results for Fe contents in COFBTC and the as-obtained pfSAC-Fe-0.2.
  • Table S4. Comparison of the performance of the zinc-air batteries based on pfSAC-Fe-0.2 and other electrocatalysts.
  • References (3853)

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