The effect of gold on platinum oxidation in homogeneous Au–Pt electrocatalysts

Reversible Surface Segregation of Pt in a Pt3Au/C Catalyst and Its Effect on the Oxygen Reduction Reaction

“…Deconvoluted Pt 4f and Au 4f signals are shown in Figure S2 (Supporting Information), and the results are summarized in Table S1 (Supporting Information). The formation of a PtAu alloy was confirmed by the shift of the Au binding energy (BE) toward lower values (pure Au: 84.0 eV for 4f 7/2 ) due to electron transfer from Pt atoms to more electronegative Au atoms, as reported previously. , …”

Dopant-Dependent Electronic Structures Observed for M2Au36(SC6H13)24 Clusters (M = Pt, Pd)

“…As can be seen in the figure, whereas the 4f 7/2 peak is found at 84.4 eV for Au 38 , it shifts to lower energies and is observed at 84.1 and 84.2 eV, respectively, for Pt 2 Au 36 and Pd 2 Au 36 . This shift can be attributed to internal charge transfer from the less electronegative Pt­(Pd) dopant to the more electronegative Au atoms, ,, as has been observed for Pt- and Ag-doped metal clusters. , Figure S2B,C shows respectively Pt 4f and Pd 3d peaks, confirming the presence of Pt­(Pd) in the isolated clusters. The average compositions determined by the ratio of Pt­(Pd) dopant to Au are found to be Pt 2.2 Au 35.8 and Pd 2.0 Au 36.0 , respectively, which is in excellent agreement with those determined by mass spectrometry.…”

“…Nevertheless, the isotope pattern of the Pt-doped cluster matches well with the simulated isotope pattern of Pt 2 Au 36 (SC 6 H 13 ) 24 , as can be seen in the inset. For the Pd-doped gold cluster, a single dominant peak is observed at m/z ≈ 10117 Da (Figure 1 This shift can be attributed to internal charge transfer from the less electro-negative Pt(Pd) dopant to the more electronegative Au atoms, 47,52,53 as has been observed for Pt-and Ag-doped metal clusters. 26,54 Figure S2B,C shows respectively Pt 4f and Pd 3d peaks, confirming the presence of Pt(Pd) in the isolated clusters.…”

Microwave-Assisted Synthesis of Pt-Au Nanoparticles with Enhanced Electrocatalytic Activity for the Oxidation of Formic Acid

“…Inspection of Table 1 clearly shows that the binding energy of the Pt 4f7/2 core level decreases with increasing Au content in the electrodes (up to 0.7 eV from pure Pt to PtAu9). This is an indication of the occurrence of Au-Pt alloying, which takes place at a greater extent for larger Au contents [37]. This must be the consequence of charge transfer between Pt and Au due to their different electronegativities [37][38][39], i.e., of an electronic effect.…”