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The PdAu bimetallic nanocrystals supported on Fe 3 O 4 magnetic nanoparticles (PdAu/Fe 3 O 4) were synthesized by a facile incipient wetness impregnation method. The as-synthesized bimetallic catalyst PdAu/Fe 3 O 4 exhibits significantly enhanced catalytic properties for Heck cross-coupling reaction under aerobic condition compared to the monometallic counterparts. The enhanced catalytic activity is attributed to the low-alloyed structure with a Pd-rich shell and an Au-rich core as well as the synergistic effect between Pd and Au according to X-ray photoelectron spectroscopy (XPS) results. Also, the cycle performance of the magnetic catalyst was evaluated. Reasonable yield was achieved after 6 cycles. In addition, the catalytic behavior of PdAu/Fe 3 O 4 for Suzuki reaction was investigated, providing excellent yield and moderate cycle performance. These results suggest the magnetic bimetallic catalyst PdAu/Fe 3 O 4 is a promising catalyst for Heck and Suzuki cross-coupling reactions. [ABSTRACT FROM AUTHOR]

Solvents play a key role in controlling the fabrication and modification of nanoparticles. We herein demonstrated that the dispersibility, stability, morphology and structure of PdAu nanoparticles varied with the polarity, special functional groups and self-properties of solvents. The underlying causes for solvent dependence were attributed to the interactions between the solvent and PdAu nanoparticles coated with PVP. Additionally, in comparison with commercial Pd/C, the obtained PdAu nanowire networks prepared in different solvents exerted considerable high electrocatalytic activity and stability towards ethylene glycol and isopropanol electrooxidation, particular for the PdAu nanowire networks prepared in DMF, which exhibited the well-dispersed nanowire network structure with large quantity of surface active areas, superior electrocatalytic activity together with long-term stability. Our efforts not only highlighted the facile preparations of the effective PdAu nanowire networks for the potential anodic catalysts for the application of fuel cells, but also facilitated the selections of appropriate solvents for preparing valid catalysts. [ABSTRACT FROM AUTHOR]