Penta-Octa B₄C₂N₃: A New 2D Material for High-Performance Energy Applications

Area of Science:

• Materials Science
• Computational Chemistry
• Condensed Matter Physics

Background:

• Penta-octagraphene (POG) is a novel 2D carbon allotrope with unique electronic properties.
• Exploring inorganic analogs of carbon allotropes is crucial for discovering new materials with tailored functionalities.

Purpose of the Study:

• To design and investigate a new inorganic counterpart of POG, named POG-B4C2N3.
• To evaluate the electronic, mechanical, and hydrogen storage properties of the novel POG-B4C2N3 monolayer.

Main Methods:

• Density Functional Theory (DFT) calculations were employed for material design and property evaluation.
• Electronic band structure, mechanical moduli (Young's, shear), Poisson's ratio, and hydrogen adsorption energies were computed.

Main Results:

• POG-B4C2N3 exhibits a direct band gap of 0.32/0.86 eV.
• The material demonstrates auxetic mechanical behavior with specific Young's and shear moduli.
• Lithium-decorated POG-B4C2N3 (Li@POG-B4C2N3) shows promising reversible hydrogen storage capacity (8.35 wt %) via physisorption.

Conclusions:

• POG-B4C2N3 is a novel 2D material with interesting electronic and auxetic mechanical properties.
• Li@POG-B4C2N3 presents a viable platform for efficient and reversible hydrogen storage applications.