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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Hydrogen storage in MgAlTiFeNi high entropy alloy

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Cardoso, Katia R. [1] ; Roche, Virginie [2] ; Jorge Jr, Alberto M. ; Antiqueira, Flavio J. [3] ; Zepon, Guilherme [3, 4] ; Champion, Yannick [5]
Total Authors: 6
[1] Univ Fed Sao Paulo, Dept Sci & Technol, ICT, BR-12231280 Sao Jose Dos Campos, SP - Brazil
[2] Grenoble Alpes Univ, LEPMI, CNRS, F-38000 Grenoble - France
[3] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, BR-13565905 Sao Carlos, SP - Brazil
[4] Jorge Jr, Jr., Alberto M., Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
[5] Grenoble Alpes Univ, SIMAP, CNRS, F-38000 Grenoble - France
Total Affiliations: 5
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 858, MAR 25 2021.
Web of Science Citations: 7

In this study, the MgAlTiFeNi high entropy alloy was processed by high-energy ball milling under both argon and hydrogen atmospheres. It is shown that this alloy forms a body-centered cubic (BCC) structure when milled under an argon atmosphere (mechanical alloying-MA) and a combination of BCC, FCC, and Mg2FeH6 when milled under hydrogen pressure (reactive milling-RM). The hydrogen storage behavior of the RM-MgAlTiFeNi samples was evaluated by a combination of thermal analyses and manometric measurements in a Sieverts apparatus. The RM-MgAlTiFeNi alloy presented an initial functional hydrogen storage capacity of 0.87 wt%, which increased to 0.94 wt% after the second absorption. Also, it exhibited a high hydrogen absorption and desorption kinetics at temperatures 100 degrees C lower than the one for the desorption temperature of the commercial MgH2. Electrochemical discharge of RM-MgAlTiFeNi samples showed precisely the same hydrogen content as that obtained in the gas desorption. Electrochemical charging/discharging experiments were also performed in the MA-MgAlTiFeNi samples, which presented lower electrochemical storage capacity, a behavior probably resulting from the instability of the alloy in the alkaline solution with the formation of a hydroxide layer on its surface that hinders the electrochemical reactions. (C) 2020 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 18/09548-2 - High entropy alloys for hydrogen storage
Grantee:Kátia Regina Cardoso
Support Opportunities: Scholarships abroad - Research