THE EFFECT OF Fe AND Y ON THE HYDROGEN SORPTION PROPERTIES, THERMAL STABILITY, AND KINETICS OF HYDROGEN DESORPTION FROM THE MgH2 HYDRIDE PHASE OF A MECHANICAL ALLOY Mg + 10%wt.Fe + 5%wt.Y

  • О. Ershova Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine http://orcid.org/0000-0003-1812-862X
  • V. Dobrovolsky Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine http://orcid.org/0000-0002-7325-4103
  • Yu. Solonin Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine http://orcid.org/0000-0002-8068-1023
  • О. Koval Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine http://orcid.org/0000-0002-1328-9566
Keywords: mechanical alloy, thermodesorption spectroscopy, hydrogen-sorption properties, thermal stability, kinetics of hydrogen desorption.

Abstract

An effective and safe way to store hydrogen is to chemically bind it to metal hydrides. Despite much attention of scientist spaid to magnesium hydride, it has not found wide applications as a hydrogen material-accumulator for automotive industry because of the difficulty of two major drawbacks: high temperature (300 0C at 0,1 MPa H2) and its slow dissociation kinetics. In this work, with the aim of lowering the temperature, improvement the kinetics of the decomposition of stoichiometric MgH2 hydride the possibility of its complex doping by Fe and Y using the method of reactive mechanochemical alloying (RMA)has been investigated. Mechanical alloys Mg + 10 % wt. Fe + 5 % wt. Y (MA1) and Mg + 10 % wt. Fe (MA2) have been synthesized and its phase composition, microstructure, hydrogen-sorption properties, thermal stability and hydrogen desorption kinetics have been investigated employing the X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermodesorption spectroscopy (TDS) methods. To evaluate the influence of complex alloying on decomposition temperature and thermal stability of MgH2 phase hydrogen desorption isobars have been obtained at the first heating after RМA synthesis of МA samples and after the next cyclic hydrogenation from gas phase. All isobars were obtained at hydrogen pressure in the reactor 0.1MPa and sample heating rate of 3o/min. They were used to determine both the hydrogen desorption beginning temperature (Тbeg.) from hydride phase MgH2 of МAs and temperature Tmax, that corresponds to the maximum speed of hydrogen release. The kinetic curves of hydrogen desorption from mechanical alloys-composites have been obtained at the constant hydrogen pressure of 0.1 MPa in the reactor and temperature 310 and 330 0C. They were used to determine both the hydrogen time release of half of hydrogen quantity (τ1/2) and total hydrogen quantity release (τt) from MAs. It has been established that the addition of Fe and Y to magnesium leads to significant improvement in the kinetics of hydrogen desorption from the  hydride phase MgH2, which is evidenced by a significant reduction (in 15 and 6 times) in the time of release of half and all hydrogen from it at 330 0C. The developed materials allow their practical use at stationary application conditions.Ref.48, table 2, figures 9.

Author Biographies

О. Ershova, Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine

erchova.pngAuthor information: senior researcher, candidate of technical scienceof the departmen of structural chemistry of solids state of Frantsevycha Institute for problems of materials science of NAS of Ukraine.
Education: Dnipropetrovsk  Steel Institute, degree in "metallurgy, equipment and technology for heat treatment of metals."
Research area: The development of hydrogen-metal- hydride technology for the needs of hydrogen energy. Revrsidle Hydrogen Storage Materials Investigation of the mechanisms of interaction of metals with hydrogen, depending on the nature of the chemical bond and the structural state. X-ray diffraction, X-ray absorption spectroscopy. Influence of the electronic structure, chemical state of the surface of hydride compounds on their thermodynamic properties.
Publications: 120

V. Dobrovolsky, Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine

Dobrovolsky.pngAuthor information: senior researcher, candidate phys.-math. sciences, departmen of structural chemistry of solids state of Frantsevycha Institute for problems of mate- rials science of NAS of Ukraine.
Education: National Shevchenko University, Kiev, by specialty physicist.
Research area: The main scientific interests are devoted to researches of atomic and electronic structure by the method of X-ray photoelectron absorption spectroscopy, surface chemistry, hydrogen sorption and thermodynamic properties of intermetallide hydrides and REM, hydrated phases of mechanical alloys on the basis of Mg, Ti. Research in the direction of hydrogen material science, in particular X - ray spectroscopic studies of the electronic structure and the nature of the metal - hydrogen chemical bond in the hydrides of intermetallic, oxygen stabilized compounds.
Publications: 225

Yu. Solonin, Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine

solonin.jpg

Author information: Director of IPMS NAS of Ukraine, prof., aca- demician of the NAS of Ukraine.
Education: Kyiv polytechnic institute, engineer-metallurgist, physics of metals.
Reasearch area: materials science & solid state chemistry, advanced materials, sintered materials based on fine powders, metastable & nanocrystalline phase, hydride-forming intermetallics, metal hydride technology, nickel-metal hydride rechargeable batteries.
Publications: 310

О. Koval, Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine 3, Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine

koval.pngAuthor information: senior researcher, candidate phys.-math. sciences.,  departmen physics strength and plasticity, Institute of material science NAS Ukraine.
Education: Moscow Physical-Technical Institute, by specialty automatic and electronic, engineer-physic.
Reasearch area: Investigation іnfluence of temperature on fracture micromechanisms, brittle-to-ductile tansition, mechanical beha- vior by method of scanning electron microscopy.
Publications: 119

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Published
2020-12-27
How to Cite
ErshovaО., Dobrovolsky, V., Solonin, Y., & KovalО. (2020). THE EFFECT OF Fe AND Y ON THE HYDROGEN SORPTION PROPERTIES, THERMAL STABILITY, AND KINETICS OF HYDROGEN DESORPTION FROM THE MgH2 HYDRIDE PHASE OF A MECHANICAL ALLOY Mg + 10%wt.Fe + 5%wt.Y. Vidnovluvana Energetika, (4(63), 31-41. https://doi.org/10.36296/1819-8058.2020.4(63).31-41
Section
Complex Problems of Power Systems Based on Renewable Energy Sources