The Eyring-equation (Eq. 10a) allows the determination of the activation barrier on both metals, which turns out to be around 35 kJ/mol for Rh(pc) and 50 kJ/mol for Pt(pc) (Fig. ), from which one may infer the activation barrier on Au(pc). First, one uses the Bell/Brønsted-Evans-Polanyi (BEP) principle (Eq. 10b, subscript 𝑅 and 𝑃 referring to reactant and product, respectively, and † denotes the reference system) to determine the symmetry coefficient from the O-upd binding energies (10d), resulting in 𝛼 & ( = 0.65. Through the formal potential of the O-upd for Au(pc), its activation barrier can be determined to be around 85 kJ/mol. These results can be visualized in a reaction-energy diagram (Fig. ).