Where R is the ideal gas constant(8.314 J mol -1 K -1 ), T is the temperature (298K), F is the Faraday constant (96485 C/mol electrons) , z is the number of electrons (1 mol) transferred, E 0 SCE is the standard potential of the SCE reference electrode that has been calibrated versus RHE. The pH is 14. The potentials of the LSV were corrected by subtracting iRS, where i is the current measured at the corresponding potential and Rs is the bulk and solution resistances. The resistance RS was calculated by fitting electrochemical impedance data in the 0.1-1Hz range with the Randles circuit model. The RS for each catalyst is given in Table of the SI.