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Pt monolayer coating on complex network substrate with high catalytic activity for the hydrogen evolution reaction

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Science Advances  04 Sep 2015:
Vol. 1, no. 8, e1400268
DOI: 10.1126/sciadv.1400268
  • Fig. 1 Schematic illustration of the Pt monolayer fabrication process on Au-buffered Ni foam.
  • Fig. 2 Sequential deposition of Pt monoatomic layers by pulsed electrodeposition in a pH 4 solution.

    (A) Current density and potential versus time plot for Pt monolayer deposition on 3D Ni foam substrate using the sequential technique. (B) Mass and potential change during the sequential deposition of Pt monolayers using QCM on an Au-coated quartz crystal substrate. (C) Voltammetry curve for the deposition of Pt on the Au NF/Ni foam surface by using a pulsed potential waveform in 0.5 M NaCl and 3 mM K2PtCl4 solution. Sweep rate, 50 mV s−1. (D) Illustration of self-terminating Pt deposition. Inset: Scanning electron microscopy image of Ni foam.

  • Fig. 3 QCM mass increase converted to thickness and compared with XPS measurements.
  • Fig. 4 High-performance Pt monolayer/metal NF/Ni foam electrocatalysts with high stability.

    (A) Cyclic voltammograms of various electrocatalysts in 0.5 M H2SO4 solution. RHE, reversible hydrogen electrode. (B) Overpotential (EHER) of the different electrocatalysts to achieve a current density of 10 mA cm−2 for the HER in 0.5 M H2SO4. Note that the 3.5-nm Pt/Ni foam result is from Luo et al. (30). (C) Chronopotentiometry curve of Pt monolayer/Au NF/Ni foam catalyst in 0.5 M H2SO4 solution at a constant current density of 10 mA cm−2. A Pt sheet was used as the counter electrode and a calomel electrode was used as the reference.

  • Fig. 5 The J-E plots of Au NF/Ni foam coated with 1, 2, 5, and 10 ML Pt in 0.5 M H2SO4 solution after iR correction.
  • Fig. 6 Tafel plots of the Pt monolayer on different metal NFs recorded at 50 mV s−1 in 0.5 M H2SO4 after iR correction.

    A comparison before and after the iR correction is shown in fig. S3.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/1/8/e1400268/DC1

    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 (3943)

  • Supplementary Materials

    This PDF file includes:

    • 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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