The Pt4Ge calculations found that both Ge and C additions strongly affected the charge distribution within the clusters. Additionally, the structural similarity among Pt7, Pt7Ge2, and Pt7Ge2C2 as shown in Fig. suggests that both the reduction in strong C2H4 binding sites and the enhanced thermal stability resulting from the addition of Ge and C to Pt is mainly driven by electronic effects rather than steric blocking of Pt binding sites. Therefore, Bader atomic charges were calculated to assess the effects of the heteroatoms on the metal charges. The isomers of Pt7 all have net negative charges due to electron transfer from the support to the cluster, and roughly half the Pt atoms have negative atomic charges.