Among the hybrid functionals, TPSSh shows the closest agreement with the pure GGAs, likely owing to its small amount of exact exchange. In contrast, the low slopes of the fits for B3LYP and PBE0 indicate significantly weaker binding of the OOH and O intermediates compared to the GGA predictions. This dependence on exact exchange is quite similar to that found by Busch et al. in the context of the water oxidation reaction on perfluoroporphyrins. Finally, LFESRs constructed using BP86-optimized geometries and free energy corrections (Figure ) display the same trends and show that B2PLYP produces very similar fit lines to PBE0.