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. 2024 Jun 13;17(12):2897.
doi: 10.3390/ma17122897.

New-Generation Materials for Hydrogen Storage in Medium-Entropy Alloys

Dagmara Varcholová  1   2 , Katarína Kušnírová  2 , Lenka Oroszová  2 , Jens Möllmer  3 , Marcus Lange  3 , Katarína Gáborová  1 , Branislav Buľko  1 , Peter Demeter  1 , Karel Saksl  1   2
Affiliations

New-Generation Materials for Hydrogen Storage in Medium-Entropy Alloys

Dagmara Varcholová et al. Materials (Basel). .

Abstract

This study presents the design, preparation, and characterization of thirty new medium-entropy alloys (MEAs) in three systems: Al-Ti-Nb-Zr, Al-Ti-Nb-V, and Al-Ti-Nb-Hf. The hardness of the alloys ranged from 320 to 800 HV0.3. Among the alloys studied, Al15Ti40Nb30Zr15 exhibited the highest-reversible hydrogen storage capacity (1.03 wt.%), with an H/M value of 0.68, comparable to LaNi5, but with a reduced density (5.11 g·cm-3) and without rare earth elements. This study further reveals a strong correlation between hardness and hydrogen absorption/desorption; higher hardness is responsible for reduced hydrogen uptake. This finding highlights the interplay between a material's properties and hydrogen storage behavior in MEAs, and has implications for the development of efficient hydrogen storage materials.

Keywords: AlTiNbX; absorption; hydrogen; hydrogen storage; medium-entropy alloys.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Graphical representation of phase stability regions for predicting formation of supersaturated solid solutions (medium/high entropy) in Al-Ti-Nb-Zr materials, with representative alloy compositions plotted.
Figure 2
Figure 2
Graphical representation of phase stability regions for predicting formation of supersaturated solid solutions (medium–high entropy) in Al-Ti-Nb-V materials, with representative alloy compositions plotted.
Figure 3
Figure 3
Graphical representation of phase stability regions for predicting formation of supersaturated solid solutions (medium–high entropy) in Al-Ti-Nb-Hf materials, with representative alloy compositions plotted.
Figure 4
Figure 4
The XRD powder pattern of samples from the Al-Ti-Nb-Zr system in the as-prepared state (black) and after hydrogenation (red).
Figure 5
Figure 5
The XRD powder pattern of samples from the Al-Ti-Nb-V system in the as-prepared state (black) and after hydrogenation (red).
Figure 6
Figure 6
The XRD powder pattern of samples from the Al-Ti-Nb-Hf system in the as-prepared state (black) and after hydrogenation (red).
Figure 7
Figure 7
The course of the absorption/desorption measurements of the Al15Ti40Nb30Zr15 alloy.
Figure 8
Figure 8
The relationship between material and thermodynamic parameters and hydrogen absorption and desorption in the Al-Ti-Nb-Zr system.
Figure 9
Figure 9
The relationship between material and thermodynamic parameters and hydrogen absorption and desorption in the Al-Ti-Nb-V system.
Figure 10
Figure 10
The relationship between material and thermodynamic parameters and hydrogen absorption and desorption in the Al-Ti-Nb-Hf system.
See this image and copyright information in PMC

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