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Título : Kinetics and hydrogen storage performance of Li-Mg-N-H systems doped with Al and AlCl3
Autor : Senes, Nina .
Fernández Albanesi, Luisa .
Garroni, Sebastiano
Santoru, Antonio .
Pistidda, Claudio .
Mulas, Gabriele .
Enzo, Stefano .
Gennari, Fabiana .
Publicado en: Journal of Alloys and Compounds. 2018, V. 765, p. 635–643
Editorial : Elsevier
Fecha de publicación : oct-2018
Fecha de disponibilidad: oct-2020
ISSN : 0925-8388
DOI: 10.1016/j.jallcom.2018.06.262
Resumen : Recent investigations showed the formation of new amide-chloride phases between LiNH2 and AlCl3 after milling and/or heating under hydrogen pressure. These phases exhibited a key role in the improvement of the hydrogen storage properties of the LiNH2-LiH composite. In the present work, we studied the effects of Al and AlCl3 additives on the hydrogen storage behavior of the Li-Mg-N-H system. The dehydrogenation kinetics and the reaction pathway of Al and AlCl3 modified LiNH2-MgH2 composite were investigated through a combination of kinetic measurements and structural analyses. During the first cycle, the addition of Al catalytically accelerates the hydrogen release at 200 °C. In the subsequent cycles, the formation of a new phase of unknown nature is probably responsible for both increased equilibrium hydrogen pressure and decreased dehydrogenation rate. In contrast, AlCl3 additive reacts with LiNH2-MgH2 through the milling and continues during heating under hydrogen pressure. Addition of AlCl3 leads to the formation of two cubic structures identified in the Li-Al-N-H-Cl system, which improves dehydrogenation rate by modifying the thermodynamic stability of the material. This study evidences positive effect of cation and/or anion substitution on hydrogen storage properties of the Li-Mg-N-H system.
Palabras clave: Hydrogen absorbing materials
Mechanochemical processing
Kinetics
Diffusion
Crystal structure
Materia: Materia-Estructura
Matter-Constitution
Licencia: http://creativecommons.org/licenses/by-nc-nd/4.0/
URI : http://hdl.handle.net/10259/4834
Versión del editor: https://doi.org/10.1016/j.jallcom.2018.06.262
Aparece en las colecciones: Artículos ICCRAM

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