Quantifying a heterogeneous Ru catalyst on carbon black using ADF STEM
| Autor: | Peter D. Nellist, Lewys Jones, Dogan Ozkaya, Vidar Tonaas Fauske, Aakash Varambhia, Sandra Van Aert, Annick De Backer |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Physics Analytical chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Crystal structure Carbon black 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Dark field microscopy Nanomaterial-based catalyst Catalysis Amorphous solid Chemistry chemistry 0103 physical sciences Scanning transmission electron microscopy General Materials Science 010306 general physics 0210 nano-technology Engineering sciences. Technology Carbon |
| Zdroj: | Particle and particle systems characterization |
| ISSN: | 0934-0866 |
| DOI: | 10.1002/ppsc.201600067 |
| Popis: | Ru catalysts are part of a set of late transition metal nanocatalysts that have garnered much interest for catalytic applications such as ammonia synthesis and fuel cell production. Their performance varies greatly depending on their morphology and size, these catalysts are widely studied using electron microscopy. Using recent developments in Annular Dark Field (ADF) Scanning Transmission Electron Microscopy (STEM) quantification techniques, a rapid atom counting procedure was utilized to document the evolution of a heterogeneous Ru catalyst supported on carbon black. Areas of the catalyst were imaged for approximately 15 minutes using ADF STEM. When the Ru clusters were exposed to the electron beam, the clusters changed phase from amorphous to crystalline. To quantify the thickness of the crystalline clusters, two techniques were applied (simulation and statistical decomposition) and compared. These techniques show that stable face centred cubic crystal structures in the form of rafts, between 2 and 8 atoms thick, were formed after the initial wetting of the carbon support. |
| Databáze: | OpenAIRE |
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