How 10 at% Al Addition in the Ti-V-Zr-Nb High-Entropy Alloy Changes Hydrogen Sorption Properties |
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| Authors: | Jorge Montero Gustav Ek Laetitia Laversenne Vivian Nassif Martin Sahlberg Claudia Zlotea |
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| Affiliation: | 1.University Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France;2.Department of Chemistry–Ångström Laboratory, Uppsala University, P.O. Box 523, SE-75120 Uppsala, Sweden; (G.E.); (M.S.);3.University Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France; (L.L.); (V.N.) |
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| Abstract: | Al0.10Ti0.30V0.25Zr0.10Nb0.25 was prepared to evaluate the effect of 10% aluminum into the previously reported quaternary alloy, Ti0.325V0.275Zr0.125Nb0.275. The as-cast quinary alloy formed a single-phase body centered cubic solid solution and transformed into a body centered tetragonal after hydrogenation. The alloy had a storage capacity of 1.6 H/M (2.6 wt.%) with fast absorption kinetics at room temperature, reaching full capacity within the first 10 min. The major improvements of Al addition (10%) were related to the desorption and cycling properties of the material. The temperature for hydrogen release was significantly decreased by around 100 °C, and the quinary alloy showed superior cycling stability and higher reversible storage capacity than its quaternary counterpart, 94% and 85% of their respective initial capacity, after 20 hydrogenation cycles without phase decomposition. |
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| Keywords: | high-entropy alloys hydrogen absorption/desorption in situ neutron diffraction cycling stability |
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