Fig. 5
Electrocatalytic performance of PtSA/S–C and PtNC/S–C. a HER polarization curves of PtSA/S–C, PtNC/S–C, and commercial Pt/C in 0.5 M H2SO4 at room temperature. b Mass activity of PtSA/S–C, PtNC/S–C, and commercial Pt/C at an overpotential of 20 mV (vs. RHE). c Activity comparison of PtNC/S–C with other recently reported noble metal electrocatalysts in terms of loading amount and the overpotential at 10 mA cm−2 (seen Supplementary Table 2 for more details for the comparison). d Tafel slope of PtSA/S–C, PtNC/S–C, and commercial Pt/C acquired from a. e Exchange current density j0 of PtSA/S–C, PtNC/S–C, and commercial Pt/C. f Stability test of PtNC/S–C. The polarization curves were recorded initially and after 10,000 potential cycles between −0.15 and +0.15 V (vs. RHE) at 100 mV s−1 in 0.5 M H2SO4. All the results of our catalysts are IR corrected
