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Type: 
Journal
Description: 
The hydrogen sorption kinetics of magnesium nanoparticles prepared by inert gas condensation and coated by a magnesium oxide layer were investigated by a volumetric apparatus. The metal-hydride transformation was studied by transmission electron microscopy of the nanoparticles both in the as-prepared state and after hydrogen cycling. In small nanoparticles (≈35 nm) hydride formation proceeds by one-dimensional growth controlled by diffusion through the hydride, while the reverse transformation to metal involves interface-controlled three-dimensional growth of nuclei formed at constant rate. Large nanoparticles (≈450 nm) exhibit very low reactivity attributed to reduced probability of hydrogen dissociation/recombination and nucleation at the particle surface.
Publisher: 
AIP
Publication date: 
26 Jan 2009
Authors: 

L Pasquini, E Callini, E Piscopiello, A Montone, M Vittori Antisari, E Bonetti

Biblio References: 
Volume: 94 Issue: 4 Pages: 041918
Origin: 
Applied Physics Letters