The role of Li and Ni metals in the adsorbate complex and their effect on the hydrogen storage capacity of single walled carbon nanotubes coated with metal hydrides, LiH and NiH2

V. J. Surya, K. Iyakutti, N. Venkataramanan, H. Mizuseki, Y. Kawazoe

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

In this first principles study based on density functional theory, we report the hydrogen storage capability of (5, 5) single walled carbon nanotubes coated with Lithium hydride and Nickel hydride. The paper brings out the role of lightweight Li atom and heavy Ni atom in binding the respective hydrides and hydrogen molecules with the single walled carbon nanotubes. The investigation is carried out for half and full coverage of the adsorbates (metal hydrides) on the sidewalls of the carbon nanotubes. The clustering of the adsorbates is observed in full coverage case of both the systems and its effect on hydrogen storage capacity and binding energy is reported. The clustering patterns are different in each of the systems and dependent on the nature of the metal atom in the metal hydride. The storage capacity of single walled carbon nanotubes coated with heavy transition metal hydride is around 3 wt.% whereas it is around 6 wt.% in their counterparts coated with lightweight metal hydride.

Original languageEnglish
Pages (from-to)2368-2376
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume35
Issue number6
DOIs
Publication statusPublished - 2010 Mar

Keywords

  • Binding energy
  • Carbon nanotubes
  • Hydrogen storage capacity
  • Hydrogen storage medium (HSM)
  • Lithium hydride
  • Nickel hydride

ASJC Scopus subject areas

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

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