Characterization of Pt-​based catalyst materials by voltammetric techniques

U Koponen, H Kumpulainen, Mikael Bergelin, J Keskinen, T Peltonen, M Valkiainen, Mikael Wasberg

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

    32 Citeringar (Scopus)


    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.
    Sidor (från-till)325–333
    TidskriftJournal of Power Sources
    StatusPublicerad - 2003
    MoE-publikationstypA1 Tidskriftsartikel-refererad

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