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Hydrogen Storage Properties of a New Ti-V-Cr-Zr-Nb High Entropy Alloy

Authors :
Anis Bouzidi
Laetitia Laversenne
Vivian Nassif
Erik Elkaim
Claudia Zlotea
Institut de Chimie et des Matériaux Paris-Est (ICMPE)
Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Matériaux, Rayonnements, Structure (MRS)
Institut Néel (NEEL)
Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )
Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )
Université Grenoble Alpes (UGA)
CRG et Grands Instruments (CRG)
Synchrotron SOLEIL (SSOLEIL)
Centre National de la Recherche Scientifique (CNRS)
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.

Details

ISSN :
26734141
Volume :
3
Database :
OpenAIRE
Journal :
Hydrogen
Accession number :
edsair.doi.dedup.....8a0707211961d3820633e9e6da9b9c02
Full Text :
https://doi.org/10.3390/hydrogen3020016