Hydrogen storage in MgAlTiFeNi high entropy alloy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Alloys and Compounds Année : 2021

Hydrogen storage in MgAlTiFeNi high entropy alloy

Résumé

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 °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
Fichier principal
Vignette du fichier
Paper Mg version 02-06.pdf (893.61 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03201481 , version 1 (17-08-2021)

Identifiants

Citer

Kátia Cardoso, Virginie Roche, Alberto Jorge Jr, Flávio Antiqueira, Guilherme Zepon, et al.. Hydrogen storage in MgAlTiFeNi high entropy alloy. Journal of Alloys and Compounds, 2021, 858, pp.158357. ⟨10.1016/j.jallcom.2020.158357⟩. ⟨hal-03201481⟩
129 Consultations
449 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More