Science Advances

Supplementary Materials

This PDF file includes:

  • Derivation of relationship between i0 and Epeak
  • Cyclic voltammograms of Pt/C, Ir/C, Pd/C, and Rh/C at different pH values
  • CVs and HOR/HER polarization curves at different pH values
  • Cyclic voltammograms (CVs)
  • Correlation of exchange current densities with Epeak
  • Arrhenius plot
  • CO stripping in electrolytes with different pH values
  • Effect of anions on HOR/HER activities
  • TEM images of supported metal electrocatalysts
  • Procedure for calculating pH for buffer solutions and comparison between calculated and experimental values
  • HOR/HER polarization curves on Vulcan XC-72 in electrolytes with different pH values
  • Fig. S1. CVs of Pt/C, Ir/C, Pd/C, and Rh/C at different pH values.
  • Fig. S2. CVs and HOR/HER polarization curves at different pH values on Pt/C.
  • Fig. S3. CVs and HOR/HER polarization curves at different pH values on Ir/C.
  • Fig. S4. CVs and HOR/HER polarization curves at different pH values on Pd/C.
  • Fig. S5. CVs and HOR/HER polarization curves at different pH values on Rh/C.
  • Fig. S6. CVs of Pt/C, Ir/C, Pd/C, and Rh/C in 0.1 M KOH.
  • Fig. S7. Correlation of exchange current densities with Epeak.
  • Fig. S8. Arrhenius plots of HOR/HER activities.
  • Fig. S9. CO stripping profiles on Pt/C at different pH values.
  • Fig. S10. CO stripping profiles on Ir/C at different pH values.
  • Fig. S11. CO stripping profiles on Pd/C at different pH values.
  • Fig. S12. CO stripping profiles on Rh/C at different pH values.
  • Fig. S13. Effect of anions on HOR/HER activities.
  • Fig. S14. TEM images and histograms of Pt, Ir, Pd, and Rh/C.
  • Fig. S15. Comparison of calculated and electrochemically measured pH of the electrolytes.
  • Fig. S16. HOR/HER polarization curves on Vulcan XC-72.
  • Table S1. Particle size and surface area of Pt/C, Ir/C, Pd/C, and Rh/C.
  • Table S2. Effect of anions on Hupd peak potentials and HOR/HER exchange current densities.

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