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DOI: 10.1002/cctc.201800230

Correlative Multiscale 3D Imaging of a Hierarchical Nanoporous Gold Catalyst by Electron, Ion and X-ray Nanotomography [in press]

Fam, Yakub; Sheppard, Thomas L.; Diaz, Ana; Scherer, Torsten; Holler, Mirko; Wang, Wu; Wang, Di; Brenner, Patrice; Wittstock, Arne; Grunwaldt, Jan-Dierk

Abstract:
Tomographic imaging of catalysts allows non‐invasive investigation of structural features and chemical properties by combining large fields of view, high spatial resolution, and the ability to probe multiple length scales. Three complementary nanotomography techniques, (i) electron tomography, (ii) focused ion beam—scanning electron microscopy, and (iii) synchrotron ptychographic X‐ray computed tomography, were applied to render the 3D structure of monolithic nanoporous gold doped with ceria, a catalytically active material with hierarchical porosity on the nm and μm scale. The resulting tomograms were used to directly measure volume fraction, surface area and pore size distribution, together with 3D pore network mapping. Each technique is critically assessed in terms of approximate spatial resolution, field of view, sample preparation and data processing requirements. Ptychographic X‐ray computed tomography produced 3D electron density maps with isotropic spatial resolution of 23 nm, the highest so far demonstrated for a catalyst material, and is highlighted as an emerging method with excellent potential in the field of catalysis.


Zugehörige Institution(en) am KIT Center for Functional Nanostructures (CFN)
Institut für Nanotechnologie (INT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1867-3880
KITopen ID: 1000083336
HGF-Programm 43.22.02; LK 01
Erschienen in ChemCatChem
Vorab online veröffentlicht am 07.05.2018
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