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Título : Spectroelectrochemical study of the electrosynthesis of Pt nanoparticles/poly(3,4-(ethylenedioxythiophene) composite
Autor : Fernández Blanco, Ana Cristina
Ibáñez, David
Colina, Álvaro
Ruiz Fernández, Virginia
Heras, Aránzazu
Publicado en: Electrochimica Acta. 2014, V. 145, p. 139–147
Editorial : Elsevier
Fecha de publicación : nov-2014
ISSN : 0013-4686
DOI: 10.1016/j.electacta.2014.08.004
Resumen : UV-Visible, NIR and Raman spectroelectrochemistry techniques have been used for the in-situ study of Pt nanoparticles (PtNPs) electrosynthesis on an electrochemically generated poly(3,4-ethylenedioxythiophene) film. Two electrochemical steps have been used to obtain in a reproducible way PtNPs with catalytic properties towards methanol oxidation: 1) deposition of Pt nuclei on the polymer modified electrode, 2) growth of these nuclei to form nanoparticles yielding drastic changes in the spectroscopic signal and a significant increase of the amount of Pt. A two steps procedure facilitates an interfacial growth mechanism of the nuclei over a diffusion controlled growth. Evolution of UV-Visible and NIR spectra during these two PtNPs synthesis steps helps to understand and explain the mechanism of generation of these nanoparticles. Besides, Energy Dispersive X-Ray analysis and Scanning Electron Microscopy images registered of the composite after each step of synthesis confirm the conclusions extracted from spectroelectrochemistry data
Palabras clave: Conducting polymers
PEDOT
Platinum nanoparticles
Electrochemistry
Spectroelectrochemistry
Materia: Química analítica
Chemistry, Analytic
URI : http://hdl.handle.net/10259/3854
Versión del editor: http://dx.doi.org/10.1016/j.electacta.2014.08.004
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