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Enhancing Room-Temperature Hydrogen Storage Properties in Ti-V-Cr-Nb-Mo/Fe Multielement Alloys via Substitutional
Mohamed El Hebri Rahmouni1, Andrei Agafonov1, Faye Greaves1
1Univ. Paris-Est Creteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, Thiais 94320, France.
ACS Omega
|March 23, 2026
Summary
A new high-entropy alloy (HEA) with 6% iron shows excellent room-temperature hydrogen storage. This efficient and cost-effective material offers rapid hydrogen absorption and stable reversible capacity for future energy applications.
Area of Science:
- Materials Science
- Metallurgy
- Energy Storage
Background:
- High-entropy alloys (HEAs) are advanced materials with unique properties.
- Previous research explored Ti-V-Cr-Nb-Mo HEAs for hydrogen storage.
- Incorporating earth-abundant elements like iron is crucial for cost-effective applications.
Purpose of the Study:
- To develop a novel body-centered cubic (bcc) high-entropy alloy (HEA) incorporating iron.
- To investigate the hydrogen storage properties of the new alloy at room temperature.
- To assess the alloy's potential for next-generation hydrogen storage systems.
Main Methods:
- Synthesis of a novel bcc HEA with the composition Ti23V30Nb10Cr31Fe6.
- Experimental evaluation of hydrogen absorption and desorption characteristics.
- Analysis of enthalpy of hydride formation and cyclic stability.
Main Results:
- The Ti23V30Nb10Cr31Fe6 alloy demonstrated rapid hydrogen absorption at room temperature (25 °C).
- Achieved a maximum gravimetric hydrogen capacity of 3.4 wt %.
- Exhibited a low enthalpy of hydride formation (-34 kJ/mol H2) and stable reversible capacity (2.0 wt %) over 20 cycles.
Conclusions:
- The developed Fe-containing HEA shows promising hydrogen storage capabilities at room temperature.
- The alloy's performance, including low formation enthalpy and high cyclic stability, makes it a strong candidate for efficient hydrogen storage.
- This research highlights the potential of incorporating iron into multielement alloys for economical and advanced hydrogen storage solutions.
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