Advances in Nanoparticles

Volume 6, Issue 2 (May 2017)

ISSN Print: 2169-0510   ISSN Online: 2169-0529

Google-based Impact Factor: 2.41  Citations  

In-Situ XAFS Characterization of PtPd Nanoparticles Synthesized by Galvanic Replacement

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ABSTRACT

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.

Cite this paper

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.

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