Fig. 4: Electrochemical experimental evidences for hydrogen spillover.
From: Decoupling fast hydrogen oxidation reaction on a tandem electrocatalyst
a CV of the Pt1-Ru/C catalyst in a N2-saturated 0.5 M H2SO4 with different scan rates without iR correction. b Plots of hydrogen desorption peak position versus scan rates of the Ru/C and Pt1-Ru/C. c HER polarization curves and d Tafel plots of different catalysts in N2-saturated 0.5 M H2SO4 with a rotating speed of 1600 rpm. e Plots of log|j| at −0.05 V (RHE) versus pH for Pt1-Ru/C catalyst. f HER polarization curves of Pt/C and Pt1-Ru/C catalysts in N2-saturated 0.5 M H2SO4 aqueous solution and N2-saturated 0.5 M D2SO4 deuterium oxide (D2O) solution. g HOR polarization curves of Pt/C and Pt1-Ru/C catalysts in H2-saturated 0.5 M H2SO4 aqueous solution and H2-saturated 0.5 M D2SO4 deuterium oxide (D2O) solution. h H/D isotope effect analysis (jH2O/jD2O versus potential) for Pt/C and Pt1-Ru/C. i H2-TPD profiles of Ru/C and Pt1-Ru/C. All LSV curves were collected at a scan rate of 0.5 mV s−1 with 90% iR compensation on a RDE at 1600 rpm. The ohmic resistance (5 ± 0.3 Ω) for iR compensation was obtained from EIS analysis with a geometric area of 0.19625 cm². Source data are provided as a Source Data file. Error bars indicate standard errors obtained from 3 independent replicates.
