| Full text | |
| Author(s): |
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
|
| Affiliation: | [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 |
| Abstract | |
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 |