RT info:eu-repo/semantics/article
T1 Kinetics and hydrogen storage performance of Li-Mg-N-H systems doped with Al and AlCl3
A1 Senes, Nina .
A1 Fernández Albanesi, Luisa .
A1 Garroni, Sebastiano
A1 Santoru, Antonio .
A1 Pistidda, Claudio .
A1 Mulas, Gabriele
A1 Enzo, Stefano
A1 Gennari, Fabiana C.
K1 Hydrogen absorbing materials
K1 Mechanochemical processing
K1 Kinetics
K1 Diffusion
K1 Crystal structure
K1 Materia-Composición
K1 Matter-Constitution
AB 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.
PB Elsevier
SN 0925-8388
YR 2018
FD 2018-10
LK http://hdl.handle.net/10259/4834
UL http://hdl.handle.net/10259/4834
LA eng
NO This study has been partially supported by bilateral collaboration Project MINCyT-MAE.
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024