Abstract
Pt and PtRu nanoparticles supported on Vulcan XC-72R carbon obtained under different atmospheres (air and N2) were prepared via a polyol process in ethylene glycol solution and denoted as Pt/C−N2, Pt/C−air, PtRu/C−N2, and PtRu/C−air, respectively. The catalysts were characterized by XRD (X-ray diffraction), TEM (transmission electron microscopy), and XPS (X-ray photoelectron spectroscopy). TEM images show that metal nanoparticles are uniform in size and are well dispersed on the carbon support for all the catalysts. The mean particle sizes of Pt/C−N2, Pt/C−air, PtRu/N2, and PtRu/C−air are 2.6, 2.7, 2.3, and 1.8 nm, respectively. Among these samples, PtRu/C−air catalyst has the smallest nanoparticle size with a narrow size distribution. The three strongest diffraction peaks of both Pt/C−N2 and Pt/C−air catalysts are located at 2θ = 39°, 46°, and 67°, corresponding to the Miller indices of (111), (200), and (220) of a Pt fcc (face-centered cubic) crystal structure. The XRD pattern of PtRu/C−N2 displays an f...
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