Hydrogenation and hydrolysis properties of Mg/MgH2–Fe100–xNixOy composites

Keywords

MgH₂ composites, hydrogen sorption, magnesium hydride, hydrolysis.

Cite as

Berezovets V. V., Kononiuk O. P., Vlad Kh. I., and Zavaliy I. Yu. Hydrogenation and hydrolysis properties of Mg/MgH₂–Fe_100–xNi_xO_y composites. Physico­chemical Mechanics of Materials. 2025. 61(6), 5-12.

https://doi.org/10.15407/pcmm2025.06.005

Abstract

Hydride Mg/MgH₂–Fe_100–xNi_xO_y (x = 0, 25, 50, 75, 100 and y = 0 – ~25) composites were investigated in the hydrogen generation reaction via hydrolysis in MgCl₂ solutions. During 90 min of reaction, the best hydrogen yield was demonstrated by the composites containing Fe, Ni, and Fe₇₅Ni₂₅ additives, with conversion degree of 87, 90, and 91%, respectively. The studied materials were synthesized by reactive ball milling in a hydrogen atmosphere. Adding 10 wt% additive into Mg significantly reduced the duration required for magnesium hydride formation. Depending on the duration of mechanochemical hydrogenation, the hydrogen capacity of the samples ranged from 5.1 to 6 wt% H₂, indicating incomplete conversion of Mg into hydride, i.e., the formation of Mg/MgH₂ (or MgH_2–x) composites. All synthesized materials were investigated using scanning electron microscopy (SEM) and X-ray phase analysis (XRD).

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