JOURNAL OF ALLOYS AND COMPOUNDS | 卷:765 |
Kinetics and hydrogen storage performance of Li-Mg-N-H systems doped with Al and AlCl3 | |
Article | |
Senes, Nina1,2  Fernandez Albanesi, Luisa3  Garroni, Sebastiano4,5  Santoru, Antonio6  Pistidda, Claudio6  Mulas, Gabriele1,2  Enzo, Stefano1,2  Gennari, Fabiana3  | |
[1] Univ Sassari, Dept Chem & Pharm, Via Vienna 2, I-07100 Sassari, Italy | |
[2] INSTM, Via Vienna 2, I-07100 Sassari, Italy | |
[3] Consejo Nacl Invest Cient & Tecn, Ctr Atom Bariloche CNEA, R8402AGP, San Carlos De Bariloche, Rio Negro, Argentina | |
[4] Univ Burgos, Int Res Ctr Crit Raw Mat ICCRAM, Plaza Misael Banuelos S-N, Burgos 09001, Spain | |
[5] Univ Burgos, Adv Mat Nucl Technol & Appl Bio Nanotechnol, Consolidated Res Unit UIC 154 Castilla & Leon, Burgos 09001, Spain | |
[6] Helmholtz Zentrum Geesthacht GmbH, Mat Technol, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany | |
关键词: Hydrogen absorbing materials; Mechanochemical processing; Kinetics; Diffusion; Crystal structure; | |
DOI : 10.1016/j.jallcom.2018.06.262 | |
来源: Elsevier | |
【 摘 要 】
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 degrees 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-CI 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-MgN-H system. (C) 2018 Elsevier B.V. All rights reserved.
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