Hydrogen-sorption properties, thermal stability and kinetics of hydrogen desorption from the MgH2 phase of the mechanical alloy of Mg with Si, Ti, Fe

Keywords: Mechanical alloy, Hydrogen-sorption properties, Thermal stability, Kinetics, Thermodesorption spectroscopy

Abstract

Scientists all over the world have made a lot of studies regarding
development of new hydrogen-accumulating magnesium-based
materials. Practical use of these materials is restricted by the
problem, which has not been solved so far. This problem concerns
two well-known significant disadvantages of magnesium
hydride and Mg-based alloys, namely their slow kinetics of hydriding-
dehydriding and high dissociation temperature (3000 C at
0,1 MPa H2). The main difficulty is that at a decrease in decomposition
temperature an increase in decomposition rate should be
achieved (i.e. fast kinetics) while maintaining high hydrogen
capacity and cyclic stability of MgH2 hydride phase of received
mechanical alloys-composites. So a wide range of characteristics
should be provided that makes a problem today. A small addition
to magnesium of alloying element (about 10 at. %) provides a
high MgH2 hydride phase content and, accordingly, high (more
than 5% wt.) hydrogen-capacity in the synthesized alloycomposite.
The mechanical alloy MА (Mg + 5% wt. Si, + 5% wt.
Ti + 2% wt. Fe) by the method of reactive mechanical
alloyingwas synthesized. At a hydrogen pressure of 0.1 MPa
with the use of thermal desorption spectroscopy, the hydrogen
capacity, the thermal stability, the kinetics of hydrogen
desorption from the hydroid phase of MgH2 of the obtained MA
were studied.It has been established that the addition of Mg Si,
Ti, and Fe leads to a significant improvement in the kinetics of
hydrogen desorption from the obtained PMC of the hydride
phase of MgH2.Due to this alloying, the decrease in the
thermodynamic stability of MgH2 is not established.Hydrogen
capacity of CH MА after reactive grinding for 20 hours.was
found to be equal to 5.7% wt., after the first cycles of sorptiondesorption
of hydrogen equal to 5.5% wt.

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Abstract views: 37
PDF Downloads: 27
Published
2018-07-01
How to Cite
Ershova, O., Solonin, Y., Dobrovolsky, V., & Koval, A. (2018). Hydrogen-sorption properties, thermal stability and kinetics of hydrogen desorption from the MgH2 phase of the mechanical alloy of Mg with Si, Ti, Fe. Vidnovluvana Energetika, (2 (49), 26-33. Retrieved from https://ve.org.ua/index.php/journal/article/view/52
Section
Complex Problems of Power Systems Based on Renewable Energy Sources