The method of reactive ball milling was used to synthesize MgH2-based composites adding nanoparticles of complex oxides RTO3 (R-rare earth and T-transition metals) as catalysts and graphite. All composites contain 5 wt.% of complex oxides Dy0.5Nd0.5FeO3 and TbFe0.5Cr0.5O3 synthesized by the sol-gel method, and some of them additionally contain 3 wt.% of graphite. The oxides have an orthorhombic perovskite structure (GdFeO3 type) and are characterized by an average particle size of 80–300 nm. The effect of perovskites on the hydrogenation of magnesium during the milling process and the improvement of hydrogen sorption-desorption kinetics is demonstrated. The Mg–Dy0.5Nd0.5FeO3 and Mg–TbFe0.5Cr0.5O3 composites absorbed 6.7 and 6.2 wt.% of hydrogen, respectively. X-ray powder diffraction after ball milling did not reveal any new compounds, except magnesium hydride. Thermal desorption from these composites occurs in two stages at temperatures above 300°C. The activation energy (Ea) of hydrogen desorption was determined by the Kissinger method. For the composite with TbFe0.5Cr0.5O3, Ea is 123 kJ/mol, and for the composite with Dy0.5Nd0.5FeO3 Ea = 147 kJ/mol. These composites were also tested as materials for hydrogen generation by hydrolysis in pure water and MgCl2 water solutions. In pure water, the hydrogen yield during hydrolysis ranged from 320 to 350 ml per gram. The conversion degree was significantly improved by the addition of MgCl2. It reached 90% (~1400 ml/g) after 30 min of hydrolysis for the MgH2–nano-TbFe0.5Cr0.5O3. These characteristics show that the synthesized MgH2–nano-RTO3 composites can be used in hydrogen generation systems.
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The work was supported by the National Research Fund of Ukraine within the framework of grant No. 2020.02/0301 “Development of new functional materials for the needs of hydrogen energy.”
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Published in Poroshkova Metallurgiya, Vol. 62, Nos. 5–6 (551), pp. 136–147, 2023.
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Kononiuk, O.P., Zavaliy, I.Y., Berezovets, V.V. et al. Catalytic Effect of RTO3 Perovskites on Hydrogen Storage and Hydrolysis Properties of Magnesium Hydride. Powder Metall Met Ceram 62, 372–381 (2023). https://doi.org/10.1007/s11106-023-00400-6
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DOI: https://doi.org/10.1007/s11106-023-00400-6