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The aim of this work is to investigate the hydrogen sorption kinetics and thermodynamics of Mg-Ni nanoparticles at relatively low temperature in relation to their microstructure. To this purpose, Mg-Ni nanoparticles (20 at% Ni) were prepared by gas phase condensation employing two thermal vapour sources. In the as-prepared state, Mg and Ni are mixed within individual nanoparticles, but the intermetallic Mg 2 Ni compound is not fully formed. After keeping the nanoparticles at 150° C for two hours under high vacuum or at a mild hydrogen pressure of 0.15 bar, the formation of a Mg-Mg 2 Ni or MgH 2-Mg 2 NiH 0.3 nanocomposite is observed. Subsequently, fast kinetics of hydrogen sorption are recorded at 150° C with activation energy of 80±8 kJ/mol (absorption) and 60±6 kJ/mol (desorption). However, the maximum hydrogen storage capacity is limited to 2.5 wt% because the transformation from Mg 2 NiH 0.3 to Mg …
Publication date: 
5 Aug 2022

Raffaello Mazzaro, Luca Pasquini

Biblio References: 
Volume: 911 Pages: 165014
Journal of Alloys and Compounds