Sonochemical synthesis of palladium nanoparticles and its electrocatalytic activity for oxidation of formic acid
Monodispersed palladium nanoparticles can be synthesized by ultrasonic without gas protection and reductant in the palladium(Ⅱ) chlorid aqueous solution by the addition of a small quantity of polyvinylpyrrolidone (PVP). The monodispersity and column aspect of palladium nanoparticles were observed TEM and HRTEM respectively. The five X-ray diffraction peaks of the metallic Pd were carried out to indicate that Pd(Ⅱ) ions were reduced to palladium atoms Pd(0). The stabilization of nanoparticles had been investigated using FT-IR spectroscopy, and then the result showed the PVP can protect the metal nanoparticles via the coordination of the PVP carbonyl group to the palladium atoms and the steric effect of the PVP polymer long chain.
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