Resumen
Full factorial design methodology was applied to the synthesis and optimization of Pd-Ag nanobars using the polyol process as the reducer. The concentration of Br- ions, the temperature and the reaction time were selected as factors to study, whereas the yield (% nanobars) was the response to be analyzed. The nanoparticles were characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, transmission electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The nanoparticles were also tested for the ethanol electro-oxidation reaction by cyclic voltammetry in alkaline solution. The three factors had a positive effect on the response: the nanobar yield increased as the level of the variables changed from -1 to +1. The temperature and reaction time were the most determinant variables (main and interacting) on the nanobar yield, whereas the concentration of Br- influenced the yield to a lesser extent. After designing three optimum experiments, a maximum nanobar yield of 47.3% was obtained. The more negative electro-oxidation onset, higher current density and more negative current peak potential show that the incorporation of Ag into Pd nanobars improves the kinetic and thermodynamic behavior towards the ethanol electro-oxidation reaction compared with that obtained with nanometrically pure Pd nanobars. This improvement is the result of surface modification caused by the incorporation of Ag in the formation of Pd-Ag bimetallic nanobars with (200) surfaces.
Idioma original | Inglés |
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Páginas (desde-hasta) | 16632-16640 |
Número de páginas | 9 |
Publicación | RSC Advances |
Volumen | 4 |
N.º | 32 |
DOI | |
Estado | Publicada - 2014 |
Publicado de forma externa | Sí |