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On the nucleation step in the Mg-MgH2 phase transformation

TitoloOn the nucleation step in the Mg-MgH2 phase transformation
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2009
AutoriM. Antisari, Vittori, Aurora A., Mirabile Gattia Daniele, and Montone Amelia
RivistaScripta Materialia
Volume61
Paginazione1064-1067
ISSN13596462
Parole chiaveCatalysts, Crystal defects, Desorption, Fast nucleation, Free surfaces, Hydrogen, Hydrogen absorption, Hydrogen storage, Kinetic analysis, Magnesium, Metal catalyst, Nanocomposites, Nucleation, Nucleation sites, Phase transformation, Phase transformation kinetics, Physical mechanism, Reverse reactions, Scanning, Scanning electron microscopy, Surface defects
Abstract

Scanning electron microscopy was used to support kinetic analysis in order to ascertain the physical mechanisms involved in the Mg-MgH2 phase transformation. Kinetic asymmetry in hydrogen absorption and desorption was explained by the different requirements for fast nucleation in the two reactions. In particular, MgH2 nucleation in Mg is assisted by crystal defects, while free surface is the only nucleation site in the reverse reaction. This explains, for the first time, the different role of the metal catalyst in the two reactions. © 2009 Acta Materialia Inc.

Note

cited By 27

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-70349454061&doi=10.1016%2fj.scriptamat.2009.08.030&partnerID=40&md5=6fcdfba96879d56b6efbc32ad4c24102
DOI10.1016/j.scriptamat.2009.08.030
Citation KeyVittoriAntisari20091064