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<p>Composites of magnesium hydride with Fe<sub>100−</sub><sub><i>x</i></sub>Co<sub><i>x</i></sub>O<sub><i>y</i></sub> (<i>x</i> = 0, 25, 50, 75, 100, and <i>y</i> = 0–120) nanosctructured additives were synthesized by reactive ball milling in hydrogen. The weight fraction of the additive for all composites was 10 wt%. 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&#xa0;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 MgH<sub>2</sub> was not achieved. The hydride composites were also tested as hydrogen-generating materials via hydrolysis in pure water and aqueous MgCl<sub>2</sub> solutions. The degree of conversion during hydrolysis for 90 min in pure water ranged from 23% to 44% and was significantly improved with the addition of MgCl<sub>2</sub>. The best results were demonstrated by the Mg/MgH<sub>2</sub>–Fe<sub>100−</sub><sub><i>x</i></sub>Co<sub><i>x</i></sub>O<sub><i>y</i></sub> (<i>х</i> = 25, 50, and&#xa0;75) composites, which achieved a&#xa0;conversion degree of 89–94% in 0.1 M MgCl<sub>2</sub> solutions.</p>

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

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • O. P. Kononiuk,
  • V. V. Berezovets,
  • Kh. I. Vlad,
  • I. Yu. Zavaliy

摘要

Composites of magnesium hydride with Fe100−xCoxOy (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%. 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 hydride composites were also tested as hydrogen-generating materials via hydrolysis in pure water and aqueous MgCl2 solutions. The degree of conversion during hydrolysis 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–Fe100−xCoxOy (х = 25, 50, and 75) composites, which achieved a conversion degree of 89–94% in 0.1 M MgCl2 solutions.