Decoration of doped C60 fullerene with alkali metals: Prototype nanomaterial with enhanced binding energy toward hydrogen. (27th April 2017)

• Record Type: Journal Article
• Authors: Omidvar, Akbar; Mohajeri, Afshan
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 17(2017)
• Page Start: 12327
• Page End: 12338
• Publication Date: 2017-04-27
• Subjects: Metallofullerene -- Hydrogen adsorption -- Aromaticity -- Polarizability -- Doping; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.03.207
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The metal decorated fullerenes form a new class of important nanostructured materials with various potential applications. This work presents a comprehensive study to investigate the decoration of a series of alkali metals (Li, Na, and K) on pristine fullerene (C60 ) as well as boron-doped (BC59 ) and aluminum-doped (AlC59 ) structures. In the framework of density functional theory (DFT), we analyze the effects of metal decoration on the structure, stability, reactivity and electronic properties of considered fullerenes. The obtained reactivity patterns for considered metallofullerenes are validated by explicit adsorption of H2 molecule. The following outcomes can be derived from our calculations: (1) Alkali metal decoration enhances the reactivity of considered cages, however, it is more effective in the case of AlC59 . (2) Whereas the boron or aluminum doping of C60 does not alter the static dipole polarizability of the fullerene, metal decoration induces more pronounced effect on the cage polarizability. Moreover, the static dipole polarizability of pristine C60 and AlC59 fullerenes are more sensitive to metal decoration (3) Atoms in molecules analysis show that the interactions between alkali metal atoms and pristine as well as doped-C60 are noncovalent with electrostatic dominant character. (4) Consistent with the prediction of reactivity descriptors, the maximum binding strength for H2 adsorption is related to the K/AlC59 system. However, we envisage that the outcomes of current study can stimulate further researches in this area, particularly in manipulating fullerene materials for designing promising hydrogen storage medium. Graphical abstract: Highlights: Decorating C60, BC59, and AlC59 with alkali metals (Li, Na, and K). Predicting the reactivity of metallofullerenes by different electronic descriptors. Characterizing the nature of interaction between metal and fullerene. H2 adsorption on the bare and K-decorated fullerenes.