However, excessive addition of a secondary element can destabilize HO 2 *, slowing down reaction (2) and reducing activity. It is unclear whether the addition of melamine to the Pt surface destabilizes OH* in a similar manner to alloying. Additionally, it is not clear whether melamine induces changes in the d-band structure or the metal-metal distances. The objective of this study is to elucidate these effects through precise free energy computations via MD calculations.