By analyzing the electronic structure of the Sn-Pt interface, it is found that due to the higher electronegativity of Pt, electrons are transferred from Sn to adjacent Pt atoms. The number of transferred electrons at different positions of Pt is plotted in Figure . By calculating the density of states of Pt, it is found that compared with the Pt atoms in the bulk, the d band center of the Pt atom adjacent to Sn has dropped by 0.4 eV (Figure ). This decrease in the center of the d band further weakens the adsorption of O on the Pt surface (Figure ), which is beneficial to improving the catalyst's antioxidant capacity and making it exhibit higher stability.