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Nanoengineering 2D dendritic PdAgPt nanoalloys with edge-enriched active sites for enhanced alcohol electroxidation and electrocatalytic hydrogen evolution.

Lots of research reveal that the surface atoms on the top/bottom facets of the nanosheets are the key features in enhancing electrocatalytic activity while the edge and corner sites of electrocatalysts often possess a superior activity. Herein, we report a 2D dendritic PdAgPt ternary nanoalloys with abundant crystal defects such as steps, twin boundary and atomic holes which can effectively work as catalytic active-sites. The morphology of PdAgPt nanoalloys can be regulated readily from dendritic nanosheets to nanowheels. Compared with binary Pd68Ag32 nanodendrites, Pd62Pt38 nanospheres and Pt/C catalyst, the composition and morphology optimized Pd43Ag21Pt36 nanowheels exhibit best mass/specific activity and stability for methanol/ethanol oxidation reaction (MOR/EOR). The mass peak current density for EOR and MOR of Pd43Ag21Pt36 is 7.08 / 3.50 times of Pt/C catalyst. Simultaneously, the hydrogen evolution reaction (HER) performance of the Pd43Ag21Pt36 nanowheels in terms of the lowest overpotential of 9 mv at a current density of 10 mA/cm2 and high electrochemical stability is much better than that of binary Pd68Ag32 nanodendrites, Pd62Pt38 nanospheres and Pt/C.