Cover Image

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...

Full description

Saved in:
Bibliographic Details
Main Authors: Kammerer, Jochen (Author) , Duan, Xiaoyang (Author) , Neubrech, Frank (Author) , Schröder, Rasmus R. (Author) , Liu, Na (Author) , Pfannmöller, Martin (Author)
Format: Article (Journal)
Language:English
Published: February 8, 2021
In: Advanced materials
Year: 2021, Volume: 33, Issue: 11, Pages: 1-9
ISSN:1521-4095
DOI:10.1002/adma.202008259
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1002/adma.202008259
Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202008259
Get full text
Author Notes:Jochen A. Kammerer, Xiaoyang Duan, Frank Neubrech, Rasmus R. Schröder, Na Liu, and Martin Pfannmöller
Description
Summary: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.
Item Description:Im Titel ist 2 bei "γ-MgH" tiefgestellt
Gesehen am 14.09.2021
Physical Description:Online Resource
ISSN:1521-4095
DOI:10.1002/adma.202008259

Similar Items