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Cinétique de l'absorption d'hydrogène et la performance en désorption de l'hydrogène dans des alliages de LaFe(13-x)Si(x).

Hydrogen absorption kinetics and hydrogen desorption performance of LaFe(13-x)Si(x) alloys.

Auteurs : ZHANG E., CHEN Y., TANG Y., et al.

Résumé

The hydrogen absorption kinetics and hydrogen desorption PCT (pressure-capability-temperature) performance of LaFe(13-x)Si(x) (x= 1.3, 1.4, and 1.56) alloys were investigated in this paper. The results show that the hydrogen absorption of these alloys can be saturated within about one hour at near room temperature after they were activated twice at 673 K. It was found from the hydrogen desorption PCT curves at 0-4.5 bar and 273-353 K that no hydrogen desorption plateau existed in these alloys and hydrogen capacity of these alloys could be easily adjusted by changing testing temperature or pressure. On the other hand, the thermal gravimetric test results of LaFe(13-x)Si(x) hydrides show that the hydrogen desorption of them increases obviously above about 448 K and ends up to about 650 K. Finally, the results of XRD analysis indicated the NaZn(13)-type main structure of LaFe(13-x)Si(x) alloys was stable during the cycle of hydrogen absorption and desorption.

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Pages : 2009-3

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Détails

  • Titre original : Hydrogen absorption kinetics and hydrogen desorption performance of LaFe(13-x)Si(x) alloys.
  • Identifiant de la fiche : 2009-1608
  • Langues : Anglais
  • Source : 3rd International Conference on Magnetic Refrigeration at Room Temperature
  • Date d'édition : 11/05/2009

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