Science Advances

Supplementary Materials

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  • Fig. S1. Cyclic voltammogram for HUPD on Pt monolayer/Au NF/Ni foam electrode in Ar-saturated 0.5 M H2SO4 at 50 mV s−1 with two different positive potential limits. The current density is referenced to the actual Pt surface area.
  • Fig. S2. HER polarization curve on Pt monolayer/Au NF/Ni foam in 0.5 M H2SO4 solution at 50 mV s−1 (solid black lines) and after iR correction (EIR-free, dotted red lines).
  • Fig. S3. Tafel curve on Pt monolayer/Au NF/Ni foam in 0.5 M H2SO4 solution at 50 mV s−1 (solid black lines) and after iR correction (EIR-free, dotted red lines).
  • Fig. S4. The XPS spectra of the different points on a Pt monolayer/Au NF/Ni foam electrode.
  • Fig. S5. EDX and the image of element mapping of the Au NF/Ni foam.
  • Table S1. Comparison of exchange current density for proton reduction reaction in 1 M H2SO4.
  • Table S2. TOFs (s−1) for electrocatalytic hydrogen generation by various catalysts in 0.5 M H2SO4 solution.
  • Table S3. Relative metal concentrations at different areas of a Pt monolayer/Au NF/Ni foam sample measured using XPS.
  • References (39–43)

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