PIGHIN, Santiago; URRETAVIZCAYA, Guillermina; BOBET, Jean-Louis; CASTRO, Facundo

doi:10.1016/j.jallcom.2020.154000

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PIGHIN, Santiago
Centro Atómico Bariloche [Argentine]

URRETAVIZCAYA, Guillermina
Centro Atómico Bariloche [Argentine]
Instituto Balseiro

BOBET, Jean-Louis
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Alloys and Compounds. 2020, vol. 827, p. 154000

Elsevier

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The synthesis, characterization and hydrolysis properties of nanostructured MgH2 and Mg in a 0.6 M MgCl2 aqueous solution are reported. The microstructural properties of commercial MgH2 are modified by mechanical milling without additives under H2 atmosphere for 5 h. The nanostructured Mg is obtained by dehydriding the as-milled MgH2 under vacuum at 355 °C for 2.5 h. The as-milled MgH2 shows average hydrolysis properties with good hydrogen production capacity (1390 mL/g H2) and kinetics (50% of the total yield in 2.3 min). The nanostructured Mg exhibits excellent hydrolysis properties with a high yield (910 mL/g H2), fast kinetics (90% of the total yield in 2.6 min) and practically no effect of a MgO/Mg(OH)2 passivating layer. The hydrolysis properties of both materials are attributed to their morphology and microstructure. The activation energies of the reaction are estimated and the mechanisms are discussed.< Réduire

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Nanostructured Mg for hydrogen production by hydrolysis obtained by MgH2 milling and dehydriding

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