An experimental investigation on the poor hydrogen sorption properties of nano-structured LaNi5 prepared by ball-milling

Benedetto Schiavo, Giacomo D'Ali'Staiti, Schiavo, D'Al Staiti, Joseph, Sekhar, Joseph

Risultato della ricerca: Articlepeer review

13 Citazioni (Scopus)

Abstract

Nano-structured LaNi5 hydrogen storage materials prepared by ball-milling is analysed using differential scanning calorimetry (DSC) and x-ray photoelectron spectroscopy (XPS). DSC results indicate a partial elimination of defects at 500 °C in a more efficient way for the short-time ball-milled powders compared to the long-time ball-milled ones. XPS results show almost no change in the core-level electronic structure for La and Ni of LaNi5 in the bulk and the nano-structured forms, but gives an indication that the self-restoring mechanism of the active surface observed in the bulk sample (Siegmann et al. Phys. Rev. Lett. 40, 972) may not be occurring in the nano-powders. Results from the X-ray diffraction and the local structural studies together with the above observations suggest that the reduced unit-cell volume and the enhanced atomic disorder in the nano-structured LaNi5 cause a larger energy barrier for the hydrogen sorption reactions of the long-time ball-milled samples.
Lingua originaleEnglish
pagine (da-a)7914-7919
Numero di pagine6
RivistaInternational Journal of Hydrogen Energy
Volume36
Stato di pubblicazionePublished - 2011

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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