Electric field controlled CO₂ capture and CO₂/N₂ separation on MoS₂ monolayers

Area of Science:

• Materials Science
• Environmental Science
• Computational Chemistry

Background:

• Efficient carbon dioxide (CO2) capture is crucial for mitigating environmental impacts.
• Developing adsorbents with high selectivity and easy regeneration remains a significant challenge.

Purpose of the Study:

• To investigate CO2 capture and regeneration on MoS2 monolayers using electric fields.
• To assess the feasibility of MoS2 monolayers for selective CO2 separation from post-combustion gas mixtures.

Main Methods:

• Density functional theory (DFT) calculations were employed.
• Simulations explored CO2 and N2 interactions with MoS2 monolayers under varying electric fields.

Main Results:

• CO2 exhibits weak interaction with MoS2 monolayers without an electric field.
• Applying an electric field (0.004 a.u.) significantly enhances CO2 adsorption.
• Adsorbed CO2 is released without an energy barrier when the electric field is turned off.
• N2 interaction with MoS2 is minimally affected by electric fields.

Conclusions:

• MoS2 monolayers act as robust adsorbents for controllable CO2 capture.
• Electric field modulation enables selective separation of CO2 from N2 in post-combustion mixtures.