A first-principles study of sodium adsorption and diffusion on phosphorene

Area of Science:

• Materials Science
• Computational Chemistry
• Electrochemistry

Background:

• Phosphorene, a 2D material, is being explored for energy storage applications.
• Understanding dopant behavior is crucial for optimizing material performance.

Purpose of the Study:

• To investigate the structural, electronic, electrochemical, and diffusion properties of sodium-doped phosphorene.
• To assess the potential of sodium-doped phosphorene as an anode material for sodium-ion batteries.

Main Methods:

• First-principles calculations were employed to model sodium adsorption and diffusion on phosphorene.
• Binding energies, adsorption configurations, and diffusion barriers were computed.

Main Results:

• Strong binding energy confirms stable sodium adsorption on phosphorene surfaces without clustering.
• Calculated sodium intercalation capacity reached 324 mA h g⁻¹.
• Low diffusion energy barriers (40-63 meV) indicate high sodium ion mobility.

Conclusions:

• Sodium-doped phosphorene exhibits favorable properties for sodium-ion battery anodes.
• The material demonstrates potential for high capacity and efficient charge/discharge cycles.