2026-04-29T17:51:32Zhttps://riubu.ubu.es/oai/request

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

Spectroelectrochemical study of the electrosynthesis of Pt nanoparticles/poly(3,4-(ethylenedioxythiophene) composite Fernández Blanco, Ana Cristina Ibáñez Martínez, David Colina, Álvaro Ruiz Fernández, Virginia Heras, Aránzazu Conducting polymers PEDOT Platinum nanoparticles Electrochemistry Spectroelectrochemistry Química analítica Chemistry, Analytic 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 Ministerio de Ciencia y Tecnologia (CTQ2010-17127, V.R. Programa Ramon y Cajal), Junta de Castilla y Leon (GR71, BU349-U13), and Academy of Finland (V.R., Academy Research Fellow) is gratefully acknowledged. C. F-B. thanks Ministerio de Educacion, Cultura y Deporte for a predoctoral FPU fellowship. D.I. is grateful for his FPI-MICINN agreement of the Ministerio de Economia y Competitividad. ICTS of Complutense University of Madrid (Spain) and PCT-UBU of Burgos University (Spain) are also acknowledged for SEM images and EDX analysis, respectively. 2015-09-29T09:29:32Z 2015-09-29T09:29:32Z 2014-11 info:eu-repo/semantics/article info:eu-repo/semantics/submittedVersion 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 application/pdf Elsevier