Combined, these effects mean that the hybrid functionals (other than TPSSh) predict a significantly less optimistic volcano plot than GGAs (Figure (c)), with minimum overpotentials of 0.39 V and 0.51 V for B3LYP and PBE0, respectively. Furthermore, the volcano plot is less symmetrical for these functionals. The right leg, corresponding to weak binding of OOH, is limiting for a broader range of OH binding strengths when using B3LYP and PBE0.