Octahedral PtCu alloy nanocrystals with high performance for oxygen reduction reaction and their enhanced stability by trace Au

Compared with their high ORR activity, the stability of PtCu octahedral nanoparticles is not satisfied, which is hindered by the diffusion/ dissolution of low-coordinated Pt atoms at the defect sites. The trace Au atoms preferentially protects these Pt atoms and inhibits the diffusion/dissolution of these Pt atoms, which is helpful for the maintenance of the shape and thus might promise a high stability.256