Lithium-Decorated Borospherene B₄₀: A Promising Hydrogen Storage Medium

Area of Science:

• Nanomaterials Science
• Computational Chemistry
• Hydrogen Storage Technologies

Background:

• Borospherene B40, a novel boron-based nanostructure, presents new avenues for materials applications.
• The development of efficient hydrogen storage materials is crucial for clean energy solutions.
• Previous studies explored Li-decorated C60 and Ti-decorated B40 for hydrogen storage.

Purpose of the Study:

• To investigate the feasibility of using lithium-decorated B40 (Li-B40) for hydrogen storage.
• To determine the hydrogen adsorption capacity and energy characteristics of Li-B40 complexes.
• To assess the potential of Li-B40 as a material for reversible hydrogen storage.

Main Methods:

• Density Functional Theory (DFT) calculations were employed to model Li-B40 complexes.
• The adsorption energies (AE) and charge transfer were analyzed for H2 binding.
• Gravimetric hydrogen storage density was calculated for various Li-B40 configurations.

Main Results:

• Li-B40 complexes can bind up to three H2 molecules per Li site with AEs of 0.11–0.25 eV/H2.
• A gravimetric density of 7.1 wt% was achieved with Li6B40(3) adsorbing 18 H2 molecules.
• A maximum gravimetric density of 13.8 wt% was demonstrated with Li14B40-42H2(8), showing distinct adsorption characteristics compared to previous systems.

Conclusions:

• Lithium-decorated B40 is a promising candidate for reversible hydrogen storage.
• The Li-B40 system offers a unique approach to hydrogen storage compared to Li-C60 and Ti-B40.
• Further research into Li-B40 nanostructures could lead to advanced hydrogen storage materials.