The rate-limiting step and limiting potentials along each pathway are enlisted in Table . The difference between these two steps is not significant enough (maximum of 0.59 eV for rPW86) so that under bias, *OOH formation becomes less favorable for all the methods. Furthermore, the protonation of dissociated products from *O2 is still associated with a higher thermodynamic barrier which assigns *OOH reduction as the most facile pathway for all the methods. From the results, it is evident that semi-empirical dispersion combined GGA functionals predict different thermodynamics compared to bare GGA functionals. The rPW86 method, which has been previously found to poorly describe the interaction with the intermediates as well as the surface properties, is associated with the lowest potential along all the pathways suggesting its least competence in predicting the correct ORR activity. All the methods except RPBE-D3 and optB88