Characterization of Pt-based catalyst materials by voltammetric techniques

U. Koponen (Corresponding Author), Heikki Kumpulainen, M. Bergelin, Jari Keskinen, Terttu Peltonen, Matti Valkiainen, M. Wasberg

Research output: Contribution to journalArticleScientificpeer-review

32 Citations (Scopus)


Catalyst materials in form of inks, as half-MEAs and inside a polymer electrolyte membrane unit cell were characterized by cyclic voltammetry. Laboratory made Pt inks were modified with Ru, Os and Ru + Ir and the methanol oxidation activity of the created surfaces was tested. A novel electrode, which enables the study of the oxygen reduction reaction on the cathode was introduced. With the measuring device it was possible to vary the oxygen content on the ink side and the proton 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 were found to be linearly dependent on the Pt mass density in the catalyst layers. Approximately 30% of the Pt loading in the MEAs were electroactive.

Original languageEnglish
Pages (from-to)325-333
JournalJournal of Power Sources
Issue number1-2
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed


  • Pt
  • voltammetry
  • fuel cell catalyst
  • methanol


Dive into the research topics of 'Characterization of Pt-based catalyst materials by voltammetric techniques'. Together they form a unique fingerprint.

Cite this