About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Rhodium and Cobalt Oxidation: A Nanoscale Study by In-situ and in Operando Atom Probe Tomography |
Author(s) |
Sten Lambeets, Norbert Kruse, Daniel E. Perea |
On-Site Speaker (Planned) |
Sten Lambeets |
Abstract Scope |
An in situ instrument development effort is reported dedicated to studying gas/metal interactions relevant to heterogeneous catalysis and early stages of oxidation via Atom Probe Tomography and Microscopy (APT/M). An in-situ reactor cell connected to an atom probe instrument is used to expose specimens to reactive gas environments, where temperature, pressure are well controlled. We demonstrate that the reactor cell and APT/M combination provides insight for a better mechanistic understanding surface and subsurface structural changes in the O<sub>2</sub>/Rh and O<sub>2</sub>/Co systems. Tracking oxygen atoms from surface activation to bulk penetration into Rh along specific surface facet structures, we found a local heterogeneity of Co<sub>2</sub>O and CoO, where Co<sub>2</sub>O was found progressively deeper as oxidation progressed. Additionally, we will also describe the unique in operando oxidation of Co within the analysis chamber of an atom probe instrument allowing us to map, in space and time, the formation of various oxide species. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Copper / Nickel / Cobalt, Other |