The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

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

Author

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

Summary, in English

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.

Department/s

  • MAX IV Laboratory
  • Chemical Physics

Publishing year

2014

Language

English

Pages

5358-5370

Publication/Series

International Journal of Hydrogen Energy

Volume

39

Issue

10

Document type

Journal article

Publisher

Elsevier

Topic

  • Physical Sciences
  • Atom and Molecular Physics and Optics
  • Natural Sciences

Keywords

  • Synchrotron radiation
  • Electrocatalyst
  • Fuel cell
  • Pd nanoparticles

Status

Published

ISBN/ISSN/Other

  • ISSN: 1879-3487