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

Keywords

MgH₂ composites, hydrogen sorption, magnesium hydride, hydrolysis.

Cite as

Kononiuk O. P., Berezovets V. V., Vlad Kh. I., and Zavaliy I. Yu. Hydrogenation and hydrolysis properties of Mg/MgH₂–Fe_100–xCo_xO_y composites. Physicochemical Mechanics of Materials. 2025. 61(3), 107–116.

https://doi.org/10.15407/pcmm2025.03.107

Abstract

Composites of magnesium hydride with Fe_100–xCo_xO_y (x = 0, 25, 50, 75, 100 and y = 0–120) nanosctructured additives were synthesized by reactive ball milling in hydrogen. The weight fraction of the additive for all composites was 10 wt%. It was shown that the addition of nanoparticles accelerated the hydrogenation rate of magnesium during the reactive milling process. The structure of these materials was studied by scanning electron micro­scopy and X-ray phase analysis. The amount of hydrogen absorbed by the synthesized composites was 2.4–6.5 wt% depending on the milling time and the additive used, and the maximum capacity corresponding to the stoichiometric composition of MgH₂ was not achieved. The synthesized hydride composites were also tested as materials for hydrogen production by hydrolysis in pure water and aqueous MgCl₂ solutions. The degree of con­version of hydride composites during hydrolysis reactions for 90 min in pure water ranged from 23 to 44% and was significantly improved with the addition of MgCl₂. The best results were demonstrated by the Mg/MgH₂–Fe_100–xCo_xO_y (х = 25, 50 and 75) composites, for which the degree of conversion in 0.1 M MgCl₂ solutions was 89–94%.

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