Irregular PtNi nanocrystal and PtNiRu nanodendrite: Comparison of structure and methanol electrooxidation ability
In this work, platinum-nickel-ruthenium (PtNiRu) nanocrystals with different amount of Ru were synthesized by one-pot solvothermal method. In the absence and presence of ruthenium trichloride, the evolution of the structure and composition of the obtained Pt alloys was clearly observed. In comparison with the PtNi irregular nanocrystals, the PtNiRu nanospheres and nanodendrites were obtained under the same reaction condition. The structure, composition as well as the formation path of PtNiRu nanodendrites were investigated in detail. Finally, the catalytic results from the methanol oxidation suggested that the mass activity as well as the area specific activity of the PtNiRu nanodendrites shown 3.5 and 3.1 time fold higher than those of commercial Pt/C as well as a better durability, which was due to the porous structure and synergistic effect of Ni/Ru. It is expected that the present study could provide a new example for designing the low amount Ru modified Pt based alloys for the application in energy conversion.