Sc-coated Si@Al(12) as high-capacity hydrogen storage medium

Area of Science:

• Materials Science
• Physical Chemistry
• Nanotechnology

Background:

• Developing efficient hydrogen storage materials is crucial for advancing clean energy technologies.
• Nanostructured materials offer unique properties for gas adsorption and storage.
• Silicon-aluminum clusters present a novel platform for material functionalization.

Purpose of the Study:

• To investigate the adsorption and storage of hydrogen molecules on Scandium (Sc) coated Si@Al(12) clusters.
• To evaluate the binding energies and hydrogen storage capacities of these functionalized clusters.
• To assess the potential of Sc-coated Si@Al(12) as a hydrogen storage material.

Main Methods:

• Density Functional Theory (DFT) calculations were employed to model the interactions.
• The binding of Scandium atoms to the Si@Al(12) substrate was analyzed.
• Hydrogen adsorption capacities and binding energies were computed for different Sc coverages.

Main Results:

• Scandium atoms bind strongly to Si@Al(12) without clustering, facilitated by charge transfer.
• Si@Al(12) clusters coated with three and four Sc atoms adsorbed 16 and 18 H(2) molecules, respectively.
• Binding energies ranged from 0.28-0.63 eV/H(2), yielding storage capacities of 6.0-6.3 wt %.

Conclusions:

• Sc-coated Si@Al(12) clusters demonstrate significant potential for hydrogen storage.
• The material exhibits good stability and high hydrogen uptake at ambient conditions.
• These findings suggest Si@Al(12) as a viable candidate for next-generation hydrogen storage solutions.