Three-dimensional shapes and spatial distributions of Pt and PtCr catalyst nanoparticles on carbon black

Lionel Cervera Gontard, Rafal E. Dunin-Borkowski, D. Ozkaya

    Research output: Contribution to journalJournal articlepeer-review

    Abstract

    High-angle annular dark-field scanning transmission electron microscopy tomography is applied to the study of Pt and PtCr nanoparticles supported on carbon black, which are used as heterogeneous catalysts in the electrodes of proton exchange membrane fuel cells. By using electron tomography, the three-dimensional architecture of the heterogeneous catalyst system can be determined, providing high-spatial-resolution information about the shapes, faceting and crystallographies of 5-20 nm single and multiply twinned catalyst particles, as well as their positions with respect to the carbon support. Approaches that can be used to provide improved information about the distribution and orientation of the particles on their support are proposed and discussed. Our results show that electron tomography provides important information that is complementary to high-resolution lattice imaging. Both techniques are required to understand fully the nature and role of the surfaces of faceted catalyst particles.
    Original languageEnglish
    JournalJournal of Microscopy
    Volume232
    Issue number2
    Pages (from-to)248-259
    ISSN0022-2720
    DOIs
    Publication statusPublished - 2008

    Keywords

    • tomography
    • platinum alloy
    • nanoparticle shapes
    • platinum
    • Heterogeneous catalysts
    • nanoparticles

    Fingerprint

    Dive into the research topics of 'Three-dimensional shapes and spatial distributions of Pt and PtCr catalyst nanoparticles on carbon black'. Together they form a unique fingerprint.

    Cite this