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Hydrogen Storage Properties of a New Ti-V-Cr-Zr-Nb High Entropy Alloy
- Source :
- Hydrogen, Hydrogen, MDPI, 2022, 3 (2), pp.270-284. ⟨10.3390/hydrogen3020016⟩, Hydrogen; Volume 3; Issue 2; Pages: 270-284
- Publication Year :
- 2022
- Publisher :
- MDPI AG, 2022.
-
Abstract
- We are reporting the synthesis, the physicochemical, and the hydrogen sorption properties of a novel bcc high entropy alloy Ti0.30V0.25Cr0.10Zr0.10Nb0.25. At room temperature, the alloy rapidly absorbs hydrogen reaching a capacity of 2.0 H/M (3.0 wt.%) and forming a dihydride with fcc structure, as confirmed by both synchrotron X-ray diffraction and neutron diffraction. The absorption Pressure–Composition Isotherms corroborated with synchrotron X-ray diffraction prove that the reaction with hydrogen occurs within two steps, i.e., bcc alloy → bcc monohydride → fcc dihydride. The thermodynamic parameters calculated for the second step transformation evidence the formation of a stable dihydride with ΔHabs = −75 kJ/molH2. The phase transition during hydrogen/deuterium desorption was investigated by in situ synchrotron X-ray and neutron diffraction confirming a reversible reaction with hydrogen. Furthermore, the cycling properties show a decrease of the capacity over the first cycles followed by a stabilization at 2.44 wt.%, whereas the absorption kinetics improve after the first cycle reaching full capacity after only 30 s at room temperature.
- Subjects :
- neutron diffraction
thermodynamic properties
high entropy alloy
hydrogen storage
synchrotron X-ray diffraction
[CHIM.CRIS]Chemical Sciences/Cristallography
High entropy alloys
[CHIM.MATE]Chemical Sciences/Material chemistry
General Medicine
[CHIM.INOR]Chemical Sciences/Inorganic chemistry
Subjects
Details
- ISSN :
- 26734141
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- Hydrogen
- Accession number :
- edsair.doi.dedup.....8a0707211961d3820633e9e6da9b9c02
- Full Text :
- https://doi.org/10.3390/hydrogen3020016