SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Poster II
MM 23.13: Poster
Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2
Local hydrogen absorption in Pd nanoparticles observed with in-situ TEM — •Svetlana Korneychuk1, Stefan Wagner1, Georgian Melinte2, Darius Rohleder3, Phillipp Vana3, and Astrid Pundt1 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2King Abdullah University of Science and Technology, Saudi Arabia — 3Institute of Physical Chemistry Georg-August-University Göttingen, Göttingen, Germany
The mechanism of the hydrogen absorption in metals is of a high interest for many areas of hydrogen technology, such as hydrogen storage, hydrogen detection and catalysis. Palladium is an ideal model system to study hydrogen absorption in metals due to its extreme affinity to hydrogen. Nanoscale systems, such as nanoparticles and thin films, are of the high interest to hydrogen technology due to their faster interaction with hydrogen. In this work, we investigate the behavior of a model system, Pd nanoparticles, in real time with in-situ H2-gas TEM. With the special gas holder from Protochips it is possible to reach pressures up to 1 atmosphere and study the particles at elevated temperatures within the stability limit of the nanoparticles up to 200∘C. We can observe initial stages of hydrogen absorption in Pd nanoparticles and local formation of PdHx at different temperatures and pressures by using EELS. We support our observations with the in-situ strain measurements carried out with nanobeam electron diffraction. Finally, we propose a mechanism of hydrogen absorption in metallic nanoparticles based on the local PdHx formation and strain measures at different loading conditions.