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Superior hydrogen storage in high entropy alloys
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.
Univ Paris Est, Inst Chim & Mat Paris Est, UMR7182, CNRS,UPEC, 2-8 Rue Henri Dunant, F-94320 Thiais, France..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, article id 36770Article in journal (Refereed) Published
Abstract [en]

Metal hydrides (MHx) provide a promising solution for the requirement to store large amounts of hydrogen in a future hydrogen-based energy system. This requires the design of alloys which allow for a very high H/M ratio. Transition metal hydrides typically have a maximum H/M ratio of 2 and higher ratios can only be obtained in alloys based on rare-earth elements. In this study we demonstrate, for the first time to the best of our knowledge, that a high entropy alloy of TiVZrNbHf can absorb much higher amounts of hydrogen than its constituents and reach an H/M ratio of 2.5. We propose that the large hydrogen-storage capacity is due to the lattice strain in the alloy that makes it favourable to absorb hydrogen in both tetrahedral and octahedral interstitial sites. This observation suggests that high entropy alloys have future potential for use as hydrogen storage materials.

Place, publisher, year, edition, pages
2016. Vol. 6, article id 36770
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-310755DOI: 10.1038/srep36770ISI: 000388087800001PubMedID: 27829659OAI: oai:DiVA.org:uu-310755DiVA, id: diva2:1058046
Funder
Swedish Foundation for Strategic Research
Available from: 2016-12-20 Created: 2016-12-19 Last updated: 2017-11-29Bibliographically approved

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