SEM and XAS characterization at beginning of life of Pd-based cathode electrocatalysts in PEM fuel cells

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

The fuel cell performance of membrane electrode assemblies with a Pt anode and Pd, PdCu or Pd5Cu4Pt cathodes has been tested during 116 h (beginning of life). The incorporation of Cu to Pd increases the fuel cell performance. Incorporation of Pt leads to further improvement. SEM micrographs of the as-prepared and the fuel cell-tested assemblies show the effects of the 116 h of continuous operation. Nafion membranes were characterized by small angle X-ray scattering. The results show a reduction of the size of the lamellar domains in the perfluorinated matrix after fuel cell testing, but no correlation with the cathode electrocatalyst material. The cathode electrocatalysts were characterized by ex-situ synchrotron radiation X-ray diffraction and X-ray absorption spectroscopy at the Pd L-3, Cu K and Pt L-3 edges. Re-organization of Pd5Cu4Pt electrocatalyst after fuel cell testing was observed. The Cu in the electrocatalyst can be described as a nano-mixture of metallic Cu, alloyed Cu and CuO. The CuO acts as a promoter of the ORR. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Detaljer

Författare
  • Karina Suarez Alcantara
  • D. C. Martinez-Casillas
  • Kaibo Zheng
  • Qiushi Zhu
  • Mohamed Qenawy
  • Dörthe Haase
  • Tönu Pullerits
  • O. Solorza-Feria
  • Sophie Canton
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysik
  • Atom- och molekylfysik och optik
  • Naturvetenskap

Nyckelord

Originalspråkengelska
Sidor (från-till)5358-5370
TidskriftInternational Journal of Hydrogen Energy
Volym39
Utgivningsnummer10
StatusPublished - 2014
PublikationskategoriForskning
Peer review utfördJa