Metal-hydride transformation kinetics in Mg nanoparticles

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

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Abstract

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. © 2009 American Institute of Physics.
Original languageEnglish
Article number041918
Pages (from-to)-
JournalApplied Physics Letters
Volume94
Issue number4
DOIs
Publication statusPublished - 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Pasquini, L., Callini, E., Piscopiello, E., Montone, A., Antisari, M. V., & Bonetti, E. (2009). Metal-hydride transformation kinetics in Mg nanoparticles. Applied Physics Letters, 94(4), -. [041918]. https://doi.org/10.1063/1.3077186