Understanding the Crucial Significance of the Temperature and Potential Window on the Stability of Carbon Supported Pt-Alloy Nanoparticles as Oxygen Reduction Reaction Electrocatalysts.

Since Pt “protects” the less noble metal, the dissolution of Pt in the case of Pt-alloys is always followed by the dissolution of the less noble metal, 25 , 26 a higher degree of Pt dissolution also means more dissolved Co, which is exactly the trend we observe in Figure 4 a–c (see also SI, Figures S8a–c and S9a–c to observe similar temperature-dependent metal dissolution trends with d-int–Pt-Cu/C and d-int–Pt-Ni/C electrocatalysts); (ii) since we instead observe a decreasing trend (signal) for Pt dissolution with increasing temperature with the MS detector ( Figure 4 a–c), this in some way contradicts our previous statement (“a higher degree of Pt dissolution also means more dissolved Co”).

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