Abstract
Bimetallic alloy nanoparticles consisting of two noble metals Pt−Ag supported on carbon with a variable dimension were successfully prepared by ethylene glycol (EG) synthesis method. This work highlights the viability of EG synthesis methodology yielding a range of particle size from 1.2 to 3.1 nm with 1:1 atomic composition but with different alloying extents by a simple control over the solution pH of the preparation medium. The physical properties of resultant Pt−Ag/C nanoparticles such as size, structure, composition, coordination, and alloying extent parameters as well as d-band unfilled states of Pt atom were systematically studied by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), transmission emission microscopy (TEM), and X-ray absorption spectroscopy (XAS) techniques. Both EDX and XAS analysis confirmed that the catalyst composition was nearly the same as that of the nominal value. It was realized that the lower preparation pH produces the Pt−Ag/C with larger dimension, wider pa...
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