New-Generation Materials for Hydrogen Storage in Medium-Entropy Alloys
oleh: Dagmara Varcholová, Katarína Kušnírová, Lenka Oroszová, Jens Möllmer, Marcus Lange, Katarína Gáborová, Branislav Buľko, Peter Demeter, Karel Saksl
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2024-06-01 |
Deskripsi
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 HV<sub>0.3</sub>. Among the alloys studied, Al<sub>15</sub>Ti<sub>40</sub>Nb<sub>30</sub>Zr<sub>15</sub> exhibited the highest-reversible hydrogen storage capacity (1.03 wt.%), with an H/M value of 0.68, comparable to LaNi<sub>5</sub>, but with a reduced density (5.11 g·cm<sup>−3</sup>) 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.