Abstract
The Pt-Ni bimetallic nanoparticles supported on nano carbon (PtxNiy/C) have been synthesized by the polyol reduction under ultrasonic irradiation. The morphology, structure and specific area of synthesized materials were characterized by X-Ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption (BET). The electrocatalytic activity for alcohol oxidation of the synthesized PtxNiy/C materials and the commercial 10wt.% Pt loaded on activated carbon catalyst (Aldrich Sigma, Pt/C_com) was investigated by cyclic voltammetry (CV) and chronoamperometry (CA). The catalytic activity for oxygen reduction reaction (ORR) of PtxNiy/C was investigated by CV and linear sweep voltammetry (LSV). The major size of synthesized metallic particles was around 2 nm. The Pt2Ni1/C exhibited excellent catalytic properties for alcohol oxidation compared to other catalysts on the same support. The CNTs were found to be more effective than carbon Vulcan for use as a support for alcohol oxidation catalysts. The linear sweep voltammograms showed that PtxNiy/C, which has the least coverage of oxygenated species, was the best catalyst for ORR with its onset potential of 0.624 V. From the slope of Koutecky-Levich plot for ORR using PtxNiy/VC materials as catalysts it was found that the overall electron transfer number ranged from 3 to 4, leading to the suggestion of H2O2 formation as an intermediate of the ORR.
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