Characterization of Pt-​based catalyst materials by voltammetric techniques

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Koponen U, Kumpulainen H, Bergelin M, Keskinen J, Peltonen T, Valkiainen M, Wasberg M
Publication year: 2003
Journal: Journal of Power Sources
Journal acronym: JPS
Volume number: 118
Issue number: 1-2
Start page: 325
End page: 333
ISSN: 0378-7753
eISSN: 1873-2755


Abstract

Catalyst materials in inks, in half-​MEAs and in a polymer electrolyte membrane (PEM) fuel cell were characterized by cyclic voltammetry. Lab.-​made Pt inks were modified with Ru, Os and Ru+Ir and the MeOH oxidn. activity of the created surfaces was tested. A novel electrode, which enables the study of the O redn. reaction on the cathode was introduced. With this measuring device it was possible to vary the O content on the ink side and the p activity of the electrolyte on the membrane side of a half-​MEA. Catalyst layers based on Pt, Pt-​Ru and Pt-​Co inside a PEM-​unit cell were also characterized in situ by cyclic voltammetry. The active surface areas are linearly dependent on the Pt mass d. in the catalyst layers. Approx. 30​% of the Pt loading in the MEA was electroactive.

Last updated on 2019-10-12 at 02:40