TY - JOUR A1 - Grothausmann, R. A1 - Zehl, G. A1 - Manke, I. A1 - Fiechter, S. A1 - Bogdanoff, P. A1 - Dorbandt, I. A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Hentschel, Manfred P. A1 - Schumacher, G. A1 - Banhart, J. T1 - Quantitative structural assessment of heterogeneous catalysts by electron tomography T2 - Journal of the American chemical society N2 - We present transmission electron microscope (TEM) tomography investigations of ruthenium-based fuel cell catalyst materials as employed in direct methanol fuel cells (DMFC). The digital three-dimensional representation of the samples not only enables detailed studies on number, size, and shape but also on the local orientation of the ruthenium particles to their support and their freely accessible surface area. The shape analysis shows the ruthenium particles deviate significantly from spherical symmetry which increases their surface to volume ratio. The morphological studies help to understand the structure formation mechanisms during the fabrication as well as the high effectiveness of these catalysts in the oxygen reduction reaction at the cathode side of fuel cells. PB - American Chemical Society CY - Washington, DC KW - Electron tomography KW - Reconstruction algorithm KW - Catalyst KW - Fuel cell PY - 2011 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/24833 AN - OPUS4-24833 SN - 0002-7863 SN - 1520-5126 VL - 133 IS - 45 SP - 18161 EP - 18171 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany