2026-06-17T23:33:14Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/38542021-11-10T09:38:17Zcom_10259_3844com_10259_5086com_10259_2604col_10259_3845

Fernández Blanco, Ana Cristina Ibáñez Martínez, David Colina, Álvaro Ruiz Fernández, Virginia Heras, Aránzazu Conducting polymers PEDOT Platinum nanoparticles Electrochemistry Spectroelectrochemistry 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 2015-09-29 2015-09-29 2014-11 info:eu-repo/semantics/article 0013-4686 http://hdl.handle.net/10259/3854 10.1016/j.electacta.2014.08.004 eng Electrochimica Acta. 2014, V. 145, p. 139–147 http://dx.doi.org/10.1016/j.electacta.2014.08.004 info:eu-repo/grantAgreement/JCyL/GR71 info:eu-repo/grantAgreement/JCyL/BU349-U13 info:eu-repo/grantAgreement/MINCYT/CTQ2010-17127 info:eu-repo/semantics/openAccess Elsevier