Theoretical and Experimental Research of Hydrogen Solid Solution in Mg and Mg-Al System

Abstract

The study of hydrogen storage properties of Mg-based thin films is of interest due to their unique composition, interface, crystallinity, and high potential for use in hydrogen-storage systems. Alloying Mg with Al leads to the destabilization of the magnesium hydride reducing the heat of reaction, increases the nucleation rate, and decreases the dehydriding temperature. The purpose of our study is to reveal the role of the aluminum atom addition in hydrogen adsorption and accumulation in the Mg-H solid solution. Ab initio calculations of aluminum and hydrogen binding energies in magnesium were carried out in the framework of density functional theory. Hydrogen distribution and accumulation in Mg and Mg-10%Al thin films were experimentally studied by the method of glow-discharge optical emission spectroscopy and using a hydrogen analyzer, respectively. It was found that a hydrogen distribution gradient is observed in the Mg-10%Al coating, with more hydrogen on the surface and less in the bulk. Moreover, the hydrogen concentration in the Mg-10%Al is lower compared to Mg. This can be explained by the lower hydrogen binding energy in the magnesium-aluminum system compared with pure magnesium.

Hydrogen storage on Lithium chloride/Lithium bromide surface at cryogenic temperature

“…al. have testified some hydrogen storage material where theoretical findings support the experimental results[62,63]. In our current report, for all systems, the adsorption process is thermodyanically physible at cryogenic temperature, and study with synthetic approach is much eaiser for LiCl and LiBr as both are available common compounds.…”

Improvement of the Hydrogen Storage Characteristics of MgH2 with Al Nano-Catalyst Produced by the Method of Electric Explosion of Wires

“…For this purpose, various additives were used, among which platinum group metals, such as nickel [18,19], hydride-forming Ce, New Brunswick, Ti [20], low-temperature hydrides of the LaNi 5 type [21][22][23], non-hydride-forming by the type of iron, cobalt, and chromium, positively affecting the kinetics of the sorption of magnesium-based hydrides [24,25], as well as metal oxides [8]. Three-dimensional transition metalloids and oxides could change and significantly improve the sorption kinetics [9,10,13,[26][27][28][29][30][31].…”

State of the Art in Development of Heat Exchanger Geometry Optimization and Different Storage Bed Designs of a Metal Hydride Reactor

“…This method provides safely and energy-capacitive hydrogen storage [ 8 , 9 , 10 ]. Hydrogen storage in metal hydrides is the one of the safest methods as well [ 11 , 12 ]. Metal hydrides exhibit acceptable hydrogen storage properties at low pressures, and their bulk density is comparable to that of liquid hydrogen.…”