Electrochemical and XAS investigation of oxygen reduction reaction on Pt-TiO2-C catalysts

Research output: Contribution to journalArticle

Abstract

Pt-TiO2-C composites with different titanium oxide loading were synthesized by photo-deposition and chemical vapor deposition methods. The changes in their electronic properties improve the electrochemical activity toward the oxygen reduction reaction (ORR) compared to the Pt-C catalyst synthesized at the same conditions. The platinum samples were physically characterized by means of Transmission Electron Microscopy (TEM), Small Angle X-ray Scattering (SAXS), X-ray Absorption Spectroscopy (XAS) and X-ray Photo-electron Spectroscopy (XPS). Their electrochemical activity was also investigated by cyclic and linear voltammetry techniques. TEM analysis shows homogeneously dispersed platinum nanoparticles with an average particle size of 2 nm in all the synthesized samples. Form factor (morphology model) and particle size were determined by SAXS, the data adjusted to spherical Pt nanoparticles in both synthesis methods. XAS studies at the Pt L-3-edge shows a close interaction of Pt with the support material, i.e. C or TiO2. XPS analysis reveals surface modifications that induce electronic changes on Pt-TiO2-C. Significant differences in the ORR electrochemical activity were correlated to the TiO2 loading and the synthesis procedure. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Details

Authors
  • B. Ruiz-Camacho
  • M. A. Valenzuela
  • R. G. Gonzalez-Huerta
  • Karina Suarez Alcantara
  • Sophie Canton
  • F. Pola-Albores
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Natural Sciences
  • Physical Sciences

Keywords

  • Platinum, Titanium oxide, Oxygen reduction, XPS, Synchrotron radiation, XAS
Original languageEnglish
Pages (from-to)12648-12656
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number28
Publication statusPublished - 2013
Publication categoryResearch
Peer-reviewedYes