Synergetic Effect of FeTi in Enhancing the Hydrogen-Storage Kinetics of Nanocrystalline MgH 2

Roman Paramonov, Tony Spassov, Péter Nagy and Ádám Révész ()
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Roman Paramonov: Department of Materials Physics, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
Tony Spassov: Department of Chemistry, University of Sofia “St.Kl.Ohridski”, 1164 Sofia, Bulgaria
Péter Nagy: Department of Materials Physics, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
Ádám Révész: Department of Materials Physics, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary

Energies, 2024, vol. 17, issue 4, 1-17

Abstract: High-energy ball milling was applied to produce nanocrystalline MgH 2 -FeTi powder composites. In order to achieve a remarkable synergetic effect between the two materials, the amount of the FeTi catalyst was chosen to be 40 wt.%, 50 wt.% and 60 wt.%. The morphology and microstructure of the as-milled powders were characterized by scanning electron microscopy and X-ray diffraction, respectively. The evaluation of the diffraction profiles by the Convolutional Multiple Whole Profile fitting algorithm provided a detailed microstructural characterization of the coherently scattering α-MgH 2 crystallites. Differential scanning calorimetry experiments revealed two overlapping endotherms corresponding to the dehydrogenation of metastable γ-MgH 2 and stable α-MgH 2 hydrides. Isothermal hydrogen-sorption experiments were carried out in a Sieverts-type apparatus. It was established that the MgH 2 -40 wt.% FeTi powder is capable of absorbing 5.8 wt.% hydrogen, while extraordinary absorption kinetics were observed for the MgH 2 -50 wt.% FeTi alloy, i.e., 3.3 wt.% H 2 is absorbed after 100 s.

Keywords: hydrogen storage; kinetics; magnesium hydride; FeTi; synergetic effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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