Palladium nanoparticles (PdNPs) were synthesized on Platinum (Pt) electrode by employing a potentio-static pulse method of electrodeposition. The mechanism of electrocrystallization of PdNPs on Pt was investigated in the system containing 1 mM K₂PdCl₄in 0.1 M H₂SO₄. Experimental results show that Pdelectrodeposition follows the so-called Volmer–Weber growth mechanism. The electrodeposited PdNPs were characterized by X-ray photoelectron spectroscopy (XPS) and Field emmission scanning electronmicroscopy (FESEM). The results obtained suggested the presence of chemisorbed oxygen on the surface f PdNPs. The influence of time of deposition on the size and monodispersity of the deposited PdNPs wasinvestigated. The studies revealed that, the size of PdNPs increased with increase in the time of deposition. The synthesized Pd nanoparticles modified Pt electrode displayed significantly different voltammetricbehavior compared to bare Pt electrode and also showed high catalytic activity towards the electrooxidation of formic acid and methanol. To the best of our knowledge, this is the first report of electrosynthesis of Pd nanoparticles using potentiostatic pulse method without using any stabilizing agent or template.