Insights on mechanical and morphological metal hydride powder characteristics during hydrogen interaction and stress mitigation strategies for hydrogen storage vessels
Publication date
2026-02-06
Document type
Forschungsartikel
Author
Stahlkopf, Gerd
Passing, Maximilian
Moosmann, Julian P.
Beckmann, Felix
Karimi, Fahim
Kulvait, Vojtěch
Organisational unit
Scopus ID
Publisher
Elsevier
Series or journal
International Journal of Hydrogen Energy
ISSN
Periodical volume
215
Article ID
153776
Is referenced by
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
Keyword
hydrogen
hydrogen storage
Mechanical stress upon phase transformation
Metal hydride
dtec.bw
Abstract
Interstitial metal hydride alloys exhibit significant volume changes between the hydrogenated and dehydrogenated states during cycling, resulting in macroscopic stresses in powder beds that must be considered in tank design. Interactions are complex, and these stresses are primarily influenced by the local particle size distribution (PSD) and packing density. This study examines radial expansion forces in vertical storage containers using AB₂-type hydride alloys and synchrotron-radiation micro-computed tomography (SRμCT). Up to 50 cycles, progressive particle decrepitation occurs, with densification in the lower layers reaching a 91% packing density. This results in local pressures of up to 605 bar in the hydrogenated state. A new empirical equation links packing density to exponentially increasing stress. Experiments have shown that optimized PSDs can reduce stress by up to 45% and increase storage capacity by 87% within the same tank volume.
Description
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Version
Published version
Access right on openHSU
Metadata only access