Dendritic core-shell Au@Pd nanoparticles supported on carbon (D-Au@Pd/C) were synthesized by theseed-growth method. Pd dendrite formation on the Au surface was attributed to the nucleation andepitaxial growth of Pd atoms on specific facets of the Au NPs in the presence of adsorbed CTAC. Incontrast, anisotropic palladium growth occurred over the uncapped planes of the gold core. Thecomposition, morphology, and particle size of these catalysts were analyzed by HRTEM, HAADFSTEM, EDS mapping, XRD, and XPS. The electrocatalytic performance of the as-prepared catalyst inthe ORR was compared to that of a commercial Pd/C catalyst. The superior performance of the DAu@Pd/C material was related to the porous Pd shell and the synergetic effects between both metals.The dendritic structure allowed for an increased number of exposed active sites, and the interplaybetween both metals favored the suppression of the adsorption of hydroxyl and super hydroxyl groupson the active sites, enhancing the ORR kinetics of the Pd shell in acidic media.
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