Stabilizing γ-MgH2 at nanotwins in mechanically constrained nanoparticles
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 dehydrog...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
February 8, 2021
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| In: |
Advanced materials
Year: 2021, Jahrgang: 33, Heft: 11, Pages: 1-9 |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202008259 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1002/adma.202008259 Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202008259 
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| Verfasserangaben: | Jochen A. Kammerer, Xiaoyang Duan, Frank Neubrech, Rasmus R. Schröder, Na Liu, and Martin Pfannmöller |
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| 520 | |a 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. | ||
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| 650 | 4 | |a plasmonics | |
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