Theoretical investigation on the alkali-metal doped BN fullerene as a material for hydrogen storage

Natarajan Sathiyamoorthy Venkataramanan, Rodion Vladimirovich Belosludov, Ryunosuke Note, Ryoji Sahara, Hiroshi Mizuseki, Yoshiyuki Kawazoe

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

First-principles calculations have been used to investigate hydrogen adsorption on alkali atom doped B36N36 clusters. The alkali atom adsorption takes place near the six tetragonal bridge sites available on the cage, thereby avoiding the notorious clustering problem. Adsorption of alkali atoms involves a charge transfer process, creating positively charged alkali atoms and this polarizes the H2 molecules thereby, increasing their binding energy. Li atom has been found to adsorb up to three hydrogen molecules with an average binding energy of 0.189 eV. The fully doped Li6B36N36 cluster has been found to hold up to 18 hydrogen molecules with the average binding energy of 0.146 eV. This corresponds to a gravimetric density of hydrogen storage of 3.7 wt.%. Chemisorption on the Li6B36N36 has been found to be an exothermic reaction, in which 60 hydrogen atoms chemisorbed with an average chemisorption energy of -2.13 eV. Thus, the maximum hydrogen storage capacity of Li doped BN fullerene is 8.9 wt.% in which 60 hydrogen atoms were chemisorbed and 12 hydrogen molecules were adsorbed in molecular form.

Original languageEnglish
Pages (from-to)54-59
Number of pages6
JournalChemical Physics
Volume377
Issue number1-3
DOIs
Publication statusPublished - 2010 Nov 25

Keywords

  • BN fullerenes
  • Density functional theory
  • Gravimetric density
  • Hydrogen adsorption
  • Hydrogen storage

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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