Abstract
The mechanical alloys-composite MАs (Mg +10 % wt.Ti + 5 % wt.Y and Mg +10 % wt.Ni + 5 % wt.Y) were synthesized. The phase content, microstructure, the thermal stability, kinetics of hydrogen desorption from the MgH2 hydride phase of the obtained MAs were studiedby using XRD, SEM, TDS methods. It has been established that the addition of Ti + Y and Ni + Y to magnesium leads to significant improvement in the kinetics of hydrogen desorption from the MgH2 hydride phase, which is evidenced by a significant reduction (in 6 and 15 times)in the time of release of all hydrogen from MA1 and MA2, respectively. Due to, Ti, Ni,Y alloying, the decrease in the thermodynamic stability of MgH2 is not found.
Highlights
The development of molecular hydrogen storage systems and technologies requires the creation of new hydrogen absorption materials
We investigated the role of each of the alloying elements Al, Ti, Mn, Fe, Ni separately in lowering the decomposition temperature of stoichiometric MgH2 hydride obtained by reactive mechanical alloying (RMA) [25, 27, 29, 31], as well as the role of the pair doping with Al + Ti, Al + Fe, Al + Ni [51,52,53,54]
By the method of thermal desorption spectroscopy with a computerized automatic installation, we studied the influence of alloying elements on the hydrogen sorption properties, thermal resistance, the kinetics of hydrogen desorption from the MgH2 hydride phase
Summary
The development of molecular hydrogen storage systems and technologies requires the creation of new hydrogen absorption materials. The properties of a large number of metal-hydrogen systems are well known. The widespread use of metal hydrides and alloys for the storage of hydrogen is constrained by the fact that most of them do not fully or partially satisfy the requirements that practice has for hydrogen sorbent materials. It is known that to use the material in hydrogen storage systems on board an automobile, a hydrogen capacity of 5 – 6 % wt. Composites based on it turned out to be the most promising from the point of view of the optimal combination of such properties as high hydrogen capacity, high kinetic characteristics, reasonable cost
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