Optimizing the ORR activity of Pd based nanocatalysts by tuning their strain and particle size

The Fe2O3 shell is in situ formed during the thermal annealing treatment and could effectively prevent the coalescence of Pd2FeCo nanoparticles. Moreover, Pd2FeCo@Pt/C exhibited excellent ORR and Zn–air battery performance, implying that the surface Pt plays an important role in enhancing the activity as well as preventing degradation.