Science Advances

Supplementary Materials

This PDF file includes:

  • fig. S1. High-resolution TEM images of HG-Ni.
  • fig. S2. SEM image of HG-Ni with EDX analysis.
  • fig. S3. TEM image of HG-Ni with EDX analysis.
  • fig. S4. FTIR spectra of Ni(acac)2, HG, and HG-Ni.
  • fig. S5. UV-visible spectra of Ni(acac)2, HG, and HG-Ni.
  • fig. S6. Schematic illustrations of electrochemical tests.
  • fig. S7. CVs of HG-NiFe in 1 M KOH before and after removal of FeCl3.
  • fig. S8. GC spectrum of O2 detection.
  • fig. S9. OER durability on HG-NiFe.
  • fig. S10. TEM image of HG-NiFe with EDX analysis.
  • fig. S11. TEM images of HG-NiFe.
  • fig. S12. XRD patterns of HG, HG-Ni, and HG-NiFe.
  • fig. S13. EDTA treatment of HG-NiFe.
  • fig. S14. CVs of HG in 1 M KOH containing FeCl3.
  • fig. S15. Comparisons of CVs of HG-NiFe and HG-Fe.
  • fig. S16. DFT model of Ni-Fe sites.
  • fig. S17. Analysis of HG-NiFe in Laviron equation.
  • fig. S18. Analysis of HG-NiFex in Laviron equation.
  • fig. S19. Analysis of HG-Ni in Laviron equation.
  • fig. S20. Pourbaix diagram of HG-Ni.
  • fig. S21. CO poisoning of HG-NiFe.
  • fig. S22. CV and TOF analysis of a control sample.
  • fig. S23. Analysis of a control sample in Laviron equation.

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