Preparation and characterization of palladium and palladium-gold nanoparticles on multiwall carbon nanotubes (MWCNTs) electrocatalysts towards formic acid electrooxidation are described.  Palladium and gold have been deposited on MWCNTs by pol-yol method using PdCl₂ and HAuCl₄．4H₂O as precursors.  The catalysts synthesized after annealing in H₂(5%)/Ar mixture gas are characterized by XRD, TEM, EDS and cyclic voltammetry.  According to XRD analysis, annealed Pd-Au/MWCNTs catalyst reveals solid solution structure of Pd-Au nanoparticles.  The images of TEM show that: (i) Pd and Pd-Au nanoparticles particle sizes are in the ranges of 5-10 nm and 20-40 nm, respectively, (ii) they are both distributed uniformly on MWCNTs, and (iii) Pd-Au/MWCNTs have core/shell (Pd/Pd-Au) structure.  Pd-Au/MWCNTs shows significantly improved catalytic activity and the stability at room temperature for formic acid electrooxidation.  The specific catalysis of palladium in Pd-Au/MWCNTs is found to be more than two times higher than that of Pd/MWCNTs catalyst.

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