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New-Generation Materials for Hydrogen Storage in Medium-Entropy Alloys
Dagmara Varcholová1,2, Katarína Kušnírová2, Lenka Oroszová2
1Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Letna 9, 042 00 Kosice, Slovakia.
Researchers developed new medium-entropy alloys (MEAs) for hydrogen storage. Higher alloy hardness correlated with lower hydrogen uptake, guiding future material design.
Area of Science:
- Materials Science
- Metallurgy
- Hydrogen Storage Technologies
Background:
- Medium-entropy alloys (MEAs) offer tunable properties for advanced applications.
- Developing efficient and cost-effective hydrogen storage materials is crucial for clean energy.
Purpose of the Study:
- To design, prepare, and characterize novel MEAs for hydrogen storage.
- To investigate the relationship between alloy properties (hardness) and hydrogen storage performance.
- To identify MEAs with high hydrogen storage capacity without rare earth elements.
Main Methods:
- Synthesis and characterization of thirty new MEAs across three systems: Al-Ti-Nb-Zr, Al-Ti-Nb-V, and Al-Ti-Nb-Hf.
- Hardness testing (HV0.3) and reversible hydrogen storage capacity measurements (wt.%).
- Analysis of the correlation between alloy hardness and hydrogen absorption/desorption characteristics.
Main Results:
- Alloy hardness varied significantly, ranging from 320 to 800 HV0.3.
- Al15Ti40Nb30Zr15 demonstrated the highest reversible hydrogen storage capacity (1.03 wt.%, H/M=0.68) without rare earth elements.
- A strong inverse correlation was observed: increased hardness led to reduced hydrogen uptake.
Conclusions:
- The study successfully identified promising MEAs for hydrogen storage, notably Al15Ti40Nb30Zr15.
- Material hardness is a critical factor influencing hydrogen storage capacity in MEAs.
- These findings provide valuable insights for designing next-generation hydrogen storage materials.
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