Hydrogen storage in MgAlTiFeNi high entropy alloy
| Autor: | Virginie Roche, Guilherme Zepon, Yannick Champion, Alberto Moreira Jorge, Flávio José Antiqueira, Kátia Regina Cardoso |
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| Přispěvatelé: | Federal University of Sao Paulo (Unifesp), Electrochimie Interfaciale et Procédés (EIP), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Universidade Federal de São Carlos [São Carlos] (UFSCar), Science et Ingénierie des Matériaux et Procédés (SIMaP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Alloy Analytical chemistry chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry 01 natural sciences Hydrogen storage chemistry.chemical_compound Desorption Materials Chemistry Ball mill Argon Mechanical Engineering Metals and Alloys [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Hydrogen absorbing materials chemistry Electrochemical properties Mechanics of Materials engineering Hydroxide High entropy alloy Mechanical alloying 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds Journal of Alloys and Compounds, Elsevier, 2021, 858, pp.158357. ⟨10.1016/j.jallcom.2020.158357⟩ |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2020.158357 |
| Popis: | International audience; 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 |
| Databáze: | OpenAIRE |
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