Fig. 3: Electrocatalytic HOR performance.
a HOR polarization curves on La1Pt@HCS, Pt@HCS, Pt/Ccom, and Pt/XC-72 in H2-saturated 0.1 M KOH with a scan rate of 5 mV s−1 at a rotating rate of 1600 rpm. b HOR polarization curves of La1Pt@HCS at varied rotating speeds (inset: corresponding Koutechy-Levich plots). c Tafel plots of the kinetic current densities. d Normalized mass activity (jk,m) at an overpotential of 25 mV (vs. RHE) and specific activity (j0,s). The error bars (standard deviations) in (d) were calculated from at least three independent testing results. e Comparison of the jk,m of La1Pt@HCS at 25 mV (vs. RHE) with that of other recently reported PGM-based electrocatalysts. f HOR polarization curves of La1Pt@HCS and Pt/Ccom before and after ADT. g Chronoamperometry (j–t) response of La1Pt@HCS and Pt/Ccom catalysts in an H2-saturated 0.1 M KOH at 60 mV (vs. RHE). h Chronoamperometry (j–t) response of La1Pt@HCS and Pt/Ccom catalysts in CO (1000 ppm)/H2-saturated 0.1 M KOH at 100 mV (vs. RHE).
