Author(s)

Simon Tymen¹, Andreas C. Scheinost², Christian Friebe^1,3, Ulrich S. Schubert^1,3,4

¹Institute of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller University, Jena, Germany.
²The Rossendorf Beamline at the European Synchroton European Synchrotron Radiation Facility (ESRF), Grenoble, France and Molecular Structure Division, Institute of Radiochemistry Forschungszentrum Dresden-Rossendorf (FZD), Dresden, Germany.
³Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich-Schiller University, Jena, Germany.
⁴Jena Center for Soft Matter (JCSM), Friedrich-Schiller University, Jena, Germany.

Platinum-palladium nanoparticles are synthesized and characterized with regard to their application in fuel cells due to their high (electro) catalytic activity. Different preparation times are applied leading to different structures, from Pd cubic to core-shell PtPd concave, and different chemical compositions. The resulting particles are studied via Transmission Electron Microscopy (TEM) and in-situ X-ray absorption fine structure (XAFS) measurements. The latter allows the investigation of the oxygen reduction reaction following the variations with varying applied potentials by analysis using the Iterative Transformation Factor Analysis (ITFA) and the creation of a two-component system that consists of metallic Pt-Pd and the related oxide. With the used model, the different concentrations of the oxide are linked to the consecutive chemical steps of the oxygen reduction reaction. Finally, the catalytic activity of the particles is determined via linear scanning voltammetry and reveals a dependence on the shape and the composition of the particles.

Platinum, Palladium, Nanoparticles, Oxygen Reduction Reaction, In-Situ XAFS, ITFA

Tymen, S. , Scheinost, A. , Friebe, C. and Schubert, U. (2017) In-Situ XAFS Characterization of PtPd Nanoparticles Synthesized by Galvanic Replacement. Advances in Nanoparticles, 6, 75-91. doi: 10.4236/anp.2017.62007.