Enhanced Hydrogen Storage Capacity in Two-Dimensional Fullerene Networks

Area of Science:

• Materials Science
• Chemistry
• Physics

Background:

• Isolated C60 molecules in solvents differ from C60 networks.
• Monolayer C60 networks possess compact nanocages suitable for storage.
• Anisotropic lattice and local strains in C60 networks facilitate hydrogen interaction.

Purpose of the Study:

• Investigate hydrogen storage mechanisms in monolayer C60 networks.
• Determine the relationship between chemisorption sites and orbital distribution.
• Assess the storage capacity and stability of these C60 structures.

Main Methods:

• First-principles calculations.
• Molecular dynamics simulations.
• Analysis of orbital delocalization and strain effects.

Main Results:

• Hydrogen chemisorption occurs without chemical modification due to C60 electronic properties.
• Physisorption of hydrogen molecules is influenced by orbital distributions.
• Combined chemisorption and physisorption significantly boost storage capacity.
• High internal hydrogen pressure exceeding 116 GPa achieved at room temperature.
• Nanocage structures remain thermodynamically stable.

Conclusions:

• Monolayer C60 networks are effective solid-state hydrogen storage materials.
• The unique structure and electronic properties enable efficient hydrogen uptake.
• These networks represent a promising avenue for advanced hydrogen storage solutions.