Fig. 4

HER activity of Pt1/MC and commercial Pt/C in 0.5 M H2SO4. a Polarization curves of Pt1/MC and Pt/C before and after 1000 CV cycles. b Tafel plots of Pt1/MC and Pt/C (collected before and after 1000 CV cycles). c Reaction mechanism for the HER, calculating ΔG H* for atomic H adsorption on different defects/edge on mesoporous carbon. d Partial density of states (PDOS) of the Pt adsorbed on a single vacancy system after H adsorption. The Fermi level is shifted to zero. e Long-time running of Pt1/MC and Pt/C electrocatalysts at the same overpotential of 30 mV