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Verfasst von:Kammerer, Jochen [VerfasserIn]   i
 Duan, Xiaoyang [VerfasserIn]   i
 Neubrech, Frank [VerfasserIn]   i
 Schröder, Rasmus R. [VerfasserIn]   i
 Liu, Na [VerfasserIn]   i
 Pfannmöller, Martin [VerfasserIn]   i
Titel:Stabilizing γ-MgH2 at nanotwins in mechanically constrained nanoparticles
Verf.angabe:Jochen A. Kammerer, Xiaoyang Duan, Frank Neubrech, Rasmus R. Schröder, Na Liu, and Martin Pfannmöller
E-Jahr:2021
Jahr:February 8, 2021
Umfang:9 S.
Fussnoten:Im Titel ist 2 bei "γ-MgH" tiefgestellt ; Gesehen am 14.09.2021
Titel Quelle:Enthalten in: Advanced materials
Ort Quelle:Weinheim : Wiley-VCH, 1989
Jahr Quelle:2021
Band/Heft Quelle:33(2021), 11, Artikel-ID 2008259, Seite 1-9
ISSN Quelle:1521-4095
Abstract:Reversible hydrogen uptake and the metal/dielectric transition make the Mg/MgH2 system a prime candidate for solid-state hydrogen storage and dynamic plasmonics. However, high dehydrogenation temperatures and slow dehydrogenation hamper broad applicability. One promising strategy to improve dehydrogenation is the formation of metastable γ-MgH2. A nanoparticle (NP) design, where γ-MgH2 forms intrinsically during hydrogenation is presented and a formation mechanism based on transmission electron microscopy results is proposed. Volume expansion during hydrogenation causes compressive stress within the confined, anisotropic NPs, leading to plastic deformation of β-MgH2 via (301)β twinning. It is proposed that these twins nucleate γ-MgH2 nanolamellas, which are stabilized by residual compressive stress. Understanding this mechanism is a crucial step toward cycle-stable, Mg-based dynamic plasmonic and hydrogen-storage materials with improved dehydrogenation. It is envisioned that a more general design of confined NPs utilizes the inherent volume expansion to reform γ-MgH2 during each rehydrogenation.
DOI:doi:10.1002/adma.202008259
URL:kostenfrei: Volltext: https://doi.org/10.1002/adma.202008259
 kostenfrei: Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202008259
 DOI: https://doi.org/10.1002/adma.202008259
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:electron beam lithography
 hydrogen storage
 metastable
 MgH2
 nanomaterials
 plasmonics
 transmission electron microscopy (TEM)
K10plus-PPN:1770108351
Verknüpfungen:→ Zeitschrift
 
 
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