Li-Decorated Ti₂CF₂ MXene for Efficient Solid-State Hydrogen Storage

Area of Science:

• Materials Science
• Energy Storage
• Computational Chemistry

Background:

• Efficient hydrogen storage is critical for advancing clean energy technologies.
• Developing novel materials with high storage capacity and reversibility remains a key challenge.

Purpose of the Study:

• To investigate the potential of Lithium (Li)-decorated Ti2CF2 MXene as a hydrogen storage material.
• To evaluate the stability, adsorption mechanism, and storage capacity of the proposed material.

Main Methods:

• Density Functional Theory (DFT) calculations were employed to study Li binding and adsorption properties.
• Ab initio molecular dynamics simulations were used to assess the stability of Li decoration at room temperature.
• Gravimetric hydrogen storage capacity and desorption characteristics were theoretically determined.

Main Results:

• Lithium atoms exhibit stable binding to the Ti2CF2 surface.
• Li atoms remain dispersed at room temperature due to electrostatic repulsion, preventing clustering.
• The material demonstrates physisorption of hydrogen molecules, enabling reversible storage.
• Double-sided Li decoration significantly enhances performance, achieving a gravimetric capacity of 3.81 wt % (26 H2 molecules).
• Calculated desorption temperatures suggest practical hydrogen release conditions.

Conclusions:

• Li-decorated Ti2CF2 MXene is a mechanically robust and dynamically stable candidate for hydrogen storage.
• The material offers a favorable balance between binding strength and reversibility for practical applications.
• This study highlights the potential of MXene-based materials for efficient and reversible hydrogen storage solutions.