Abstract
Bimetallic PdxAgy alloy along with monometallic Pd, Ag nanoparticle were synthesized in a single pot using a green synthetic protocol in absence of any capping agent. X-ray diffraction and microscopic studies of synthesized material demonstrate the formation of nanoballs with radius of ca 25 nm of face centred cubic metals and alloys. The electrochemical studies of as-synthesized materials loaded on carbon support reveal that the Pd4Ag nanoparticles exhibit the best and synergistic electro-catalytic activity in reference to oxidation of propan-2-ol in alkali. The most active Pd4Ag nanoparticles show higher peak current (124.54mAmg-1) in comparison to that (92.54mAmg-1) of Pd in cyclic voltammetric study (CV). The electrode shows the highest exchange current density (0.284mAmg-1of Pd) for propan-2-ol oxidation reaction. CV studies of reaction product reveal that Ag accelerates the formation of acetone rather than carbonate elucidating the plausible mechanism of the reaction. These findings have important implications for further fine-tuning of the Pd nano alloys toward highly active and selective catalysts for alcohol fuel cells.
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