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Hydrogen storage in high-entropy alloys with varying degree of local lattice strain
Inst Energy Technol, Dept Neutron Mat Characterizat, POB 40, NO-2027 Kjeller, Norway.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0002-6486-5156
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2019 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 44, no 55, p. 29140-29149Article in journal (Refereed) Published
Abstract [en]

We have investigated the structure and hydrogen storage properties of a series of Ti, V, Zr, Nb and Ta based high-entropy alloys (HEAs) with varying degree of local lattice strain by means of synchrotron radiation powder X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry and manometric measurements in a Sieverts apparatus. The obtained alloys have body-centred cubic (bcc) crystal structures and form face-centred cubic (fcc) metal hydrides with hydrogen-to-metal ratios close to 2. No correlation between the hydrogen storage capacity and the local lattice strain delta r is observed in this work. Both bcc and fcc unit cells expand linearly with the zirconium-to-metal ratio [Zr]/[M], and increased concentration of Zr stabilizes the hydrides. When heated, the hydrides decompose into the original bcc alloys if [Zr]/[M]<12.5 at.%. The hydrides phase-separate in a hydrogen-induced decomposition type process for [Zr]/[M]>= 12.5 at.%. The result is then a combination of two bcc phases, one with a larger and the other with a smaller unit cell than the original bcc alloy. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 44, no 55, p. 29140-29149
Keywords [en]
Metal hydrides, Hydrogen storage, High-entropy alloys, HEAs
National Category
Metallurgy and Metallic Materials Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-400021DOI: 10.1016/j.ijhydene.2019.03.223ISI: 000498277200011OAI: oai:DiVA.org:uu-400021DiVA, id: diva2:1380642
Conference
16th International Symposium on Metal-Hydrogen Systems (MH), OCT 28-NOV 02, 2018, Guangzhou, PEOPLES R CHINA
Funder
Swedish Foundation for Strategic Research NordForsk, 81942Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19Bibliographically approved

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Ek, GustavKarlsson, DennisSahlberg, Martin

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