Hydrogen-sorption properties, thermal stability and kinetics of hydrogen desorption from the MgH2 phase of the mechanical alloy of Mg with Si, Ti, Fe
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.
hydride systems, Structure of nanocomposite metal hydrides
//Appl. Phys. 2001. – A 72 . – p. 187–195.
2. Shang C.X., Bououdina M., Song Y.Mechanical alloying
and electronic simulations of (MgH2 + M) systems (M = Al, Ti,
Fe, Ni, Cu, Nb) for hydrogen storege // Int. J. Hydrogen Energy
2004 – 29 . – p. 73–80.
3. Dobrovolsky V.D., Ershova O.G., Solonin Y.M., Khyzhun
O.Y, Paul-Boncour V. The influence of TiB2 upon thermal stability
of a hydride phase of the Mg-based mechanical alloy //J.
Alloys Compd. 2008. – 465. – p. 177–182.
4. Doppiu S., P., Spassov T., Barkhordarian G., Dorngeim
M., Klassen T., Surinach S., Baro M.D.Thermodynamic properties
& absorption- desorption kinetics of Mg87Ni10Al3 alloy
synthesized by reactive ball milling under H2 atmosphere Solsona
// J. Alloys Compd. 2005. – 404–406. – p. 27–30.
5. Ershova O.G., Dobrovolsky V.D., Solonin Y.M., Khyzhun
O.Y., KovalA.Y. Influence of Ti, Mn, Fe, Ni addition upon thermal
stability & decomposition temperature of the MgH2 phase
of alloys synthesized by reactive mechanical alloys //J. AlloysCompd.
– 2008. – 464. – p. 212–218.
6. Ershova O.G., Dobrovolsky V.D., SoloninYu. M. About
manner and mechanisms of reduction of thermal firmness of Mg,
Ti, Y- based mechanical alloys // Carbon Nanomaterials in Clean
Energy Hydrogen Systems (fourth ed.NATO Science for Peace
and Security Programme, Springer) 2008. – p. 429 – 436.
7. Dobrovolsky V.D.Ershova O.G., Solonin Y.M. Thermal
resistance and the kinetics of hydrogen desorption from hydrides
of the Mg–Al–Ni–Ti mechanical alloy // J. Materials Science.
2016. – 51(4). – p. 457–464.
8. Ershova O.G., Dobrovolsk V.D., Solonin Yu.M., Koval
A.Yu. Thermal stability and kinetics of hydrogen desorption
hydride fazyMgH2 mechanical alloying Mg +10% wt. Al +10%
wt.Ti//J. VidnovlyuvanaEnergetika. 2015. – v.3. – p. 5 –13.
9. Ershova O.G., Dobrovolsky V.DSolonin.,Yu.M., Khyzhun
O.Yu., KovalA.Yu. The effect of Al on thermal stability and
kinetics of decomposition of MgH2 prepared by
mechanochemical reaction at different conditions // Materials
Chemistry and Physics. 2015. – 162. – p. 408 – 416.
10. Dobrovolsky V.D, Ershova O.G., SoloninYu. M.
Mechanical alloys Mg-Me (Me: Ti, Fe, Ni, Al)& Mg-Me1-
Me2(Ме1:Al, Me2: Ti, Fe, Ni) with low resistance and improved
kinetics of hydrogenation/dehydrogenation for hydrogen storage
applications.Hydrogen in the Alternative Power Industry and
Novel Technologies [in Ukrainian], Kiev , 2015, p. 136–148.
11. Dobrovolsky V.D., Ershova O.G., Solonin Yu. M.,
KhyzhunO.Y. Influence of titanium and iron additives to magnesium
upon hydrogen-sorption properties, thermal stability and
kinetics of hydrogen desorption from MgH2 phase of mechanical
alloy //Powder Metallurgy & Metal Ceramics. 2016. – V.55.
– v. 7. – p. 477–488.
12. Polanski M., Bystrzycki J. The influence of different
additives on the solid-state rection of magnesium hydride
(MgH2) with Si // Int. J. Hydrogen Energy. – 2009. – v. 34. – p.
7692 – 7699.
13. Chaudhary Anna-Lisa, Paskevicius M., Sheppard D.A.,
Buckley C.E. Thermodynamic destabilisation of MgH2 and
NaMgH3 using Group IV elements Si, Ge or Sn // J. AlloysCompd.
2015. – v. 623. – p. 109–116.
14. Tanniru M., Slattery D.K., Ebrahimi F.Study of stability
of MgH2 in Mg-8at% Al alloy powder //Int. J. Hydrogen
Energy. 2010. – v. 35. – p. 3555–3564.
15. ZhouC., Fang Z., Lu J., Luo X., Ren C., Fan P.,Ren
Y.,Zhang Х.Thermodynamic Destabilization of Magnesium
Hydride Using Mg-Based Solid Solution //J.Phys.Chem.2014. –
v. 118. – p. 11526–11535.
16. Luo F.P.,Wang H., Ouyang L.Z., Zeng M.Q., Liu J.W.,
Zhu M.Enhanced reversible hydrogen storage propertiesof a Mg
In-Y ternary solid solution // Int. J. Hydrogen Energy. 2013. –
v. 38. – p. 10912–10916.
17. Ouyang L.Z.,Cao Z.J.,Wang H., Liu J.W., Sun D.L.
Zhang Q.A., Zhu M.Enhanced dehydriding thermodynamics and
kinetics in Mg(In)-MgF2 composite directly synthesized by
plasma milling // J. AlloysCompd. 2014. – v. 586. – p. 113–117.
18. Cao Z., Ouyang L., Wu Y., Wang H., Liu J., Fang F..,
Sun D., Zhang Q., Zhu M.Dual-tuning effects ofIn, Al, and Ti on
the thermodynamics and kinetics of Mg85In5Al5Ti5 alloy synthesized
by plasma milling // Journal of Alloys Comp. 2015. –
v. 623. – p. 354–358.
19. Min Zhu,Yanshan Lu, OuyangLiuzhang, Wang
Hui.Thermodynamic Tuning of Mg-Based Hydrogen Storage
Alloys // Materials. 2013. – v. 6. – p. 4654–4674.
20. Dobrovolsky V.D., Ershova О.G.,Khyzhun O.Y., SoloninY.
M.Influence of exposure to air and mechanical dispersion
upon thermal stability and decomposition temperature of β-
MgH2 phase, a component of composites derived by different
methods// J. Current Physical Chemistry. 2014. – v. 4(1). –
p. 106 – 114.
21. Dobrovolsky V.D., Ershova О.G.,SoloninY.M.The influence
of the method of obtaining exposure to air and MgH2 in
its thermal stability and kinetics of hydrogen desorption//J. VidnovlyuvanaEnergetika.
2015. – v. 1. – p. 14–22.
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