Variations in the ratio of gold and palladium salt solutions (HAuCl4 and K2PdCl4, respectively) when adsorbed and reduced on functionalized silicon and indium tin oxide (ITO)-coated surfaces have led to differences in the catalytic ability of the resulting in situ generated bimetallic gold-palladium nanoparticles. Atomic force microscopy (AFM) has revealed an apparent change in the nanoparticles' morphology and an increase in size and number when the solution ratio of K2PdCl4 increases relative to HAuCl4. The electrocatalytic properties of these nanoparticle arrays through the oxidation of multiple alcohols such as ethanol and ethylene glycol. Cyclic voltammetry studies revealed an enhanced catalytic conversion of ethylene glycol when the palladium ratio increased relative to gold. UV-Visible (UV-Vis) spectroscopy follows the change in optical properties before reducing the surface-bound Au and Pd ions. X-ray photoelectron spectroscopy (XPS) measures the mixed nanoparticles' elemental composition. Further, preliminary results involving the anisotropic growth of gold nanoparticles showed possible increased catalytic ability.

Generation of anisotropic gold and Au-Pd bimetallic nanoparticles on functionalized surfaces

ACS Fall 2021

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