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

Publication: Research - peer-reviewJournal article – Annual report year: 2008

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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
Publication date2008
Volume232
Journal number2
Pages248-259
ISSN0022-2720
DOIs
StatePublished
CitationsWeb of Science® Times Cited: No match on DOI

Keywords

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