which predicts p z = 0.08 e• Å vs p z = 0.21 e• Å for the z-components of the intrinsic O 2 * dipole moments, i.e. a slope more than two times smaller at Pt(111) vs Au(111). Corresponding values for the polarizability are also lower for Pt(111) with α zz =0.12 e• Å2 /V vs α zz =0.15 e• Å2 /V, in good agreement with other studies 7 (SI, Table ). We attribute this result to the inherently different reactivity between the two surfaces. The stronger chemical bond formed at Pt, especially around the PZC, gives rise to a weaker adsorbate-induced dipole as O 2 * lies closer to the surface. We note that the metal-adsorbate bond length is known to sensitively change the resulting dipole moment and specifically predict here a vacuum difference of 0.10 Å for the molecule's COM above the two surfaces at PZC (cf. SI, Figure )); a difference which is even more pronounced (0.33 Å) from the electrochemical AIMD simulations (SI, Figure )). As a result, we arrive at an almost negligible stabilization of O 2 * due to dipole-field interactions within the depicted potential range at Pt(111).