Zirconium-Modified Medium-Entropy Alloy (TiVNb) 85 Cr 15 for Hydrogen Storage

In this study, we investigate the effect of small amounts of zirconium alloying the medium-entropy alloy (TiVNb) Cr , a promising material for hydrogen storage. Alloys with 1, 4, and 7 at.% of Zr were prepared by arc melting and found to be multiphase, comprising at least three phases, indicating th...

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Bibliographic Details
Published inMaterials Vol. 17; no. 8
Main Authors Saksl, Karel, Matvija, Miloš, Fujda, Martin, Ballóková, Beáta, Varcholová, Dagmara, Kubaško, Jakub, Möllmer, Jens, Lange, Marcus, Podobová, Mária
Format Journal Article
LanguageEnglish
Published Switzerland 10.04.2024
Subjects
metal hydride
medium-entropy alloy
zirconium
hydrogen absorption
(TiVNb)85Cr15
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Summary:In this study, we investigate the effect of small amounts of zirconium alloying the medium-entropy alloy (TiVNb) Cr , a promising material for hydrogen storage. Alloys with 1, 4, and 7 at.% of Zr were prepared by arc melting and found to be multiphase, comprising at least three phases, indicating that Zr addition does not stabilize a single-phase solid solution. The dominant BCC phase ( ) is the primary hydrogen absorber, while the minor phases and play a crucial role in hydrogen absorption/desorption. Among the studied alloys, (TiVNb) Cr Zr shows the highest hydrogen storage capacity, ease of activation, and reversibly retrievable hydrogen. This alloy can absorb hydrogen at room temperature without additional processing, with a reversible capacity of up to 0.74 wt.%, corresponding to hydrogen-to-metal ratio H/M = 0.46. The study emphasizes the significant role of minor elemental additions in alloy properties, stressing the importance of tailored compositions for hydrogen storage applications. It suggests a direction for further research in metal hydride alloys for effective and safe hydrogen storage.
ISSN:1996-1944
1996-1944