Sustainable Gas Storage: CO₂ Activation of Edge-Functionalized Graphitic Nanoplatelets

Area of Science:

• Materials Science
• Nanotechnology
• Green Chemistry

Background:

• Edge-selectively carboxylated graphitic nanoplatelets (ECGnPs) offer improved dispersibility but have limited functionalization on the basal plane.
• Existing methods for enhancing graphitic nanoplatelet properties often involve harsh chemical treatments.

Purpose of the Study:

• To develop a novel method for creating porous graphitic nanoplatelets with significantly increased surface area.
• To investigate the feasibility of using carbon dioxide (CO2) as an activating agent in a green chemistry framework.
• To explore the pore structure evolution of activated graphitic nanoplatelets.

Main Methods:

• Graphitic nanoplatelets were edge-selectively carboxylated to form ECGnPs.
• ECGnPs were activated at 900°C by flowing CO2 to induce etching via the Boudouard reaction.
• The resulting porous structures were characterized by gas adsorption analysis using CH4, Ar, CO2, H2, and N2.

Main Results:

• The surface area of the graphitic nanoplatelets increased from 579 m²/g to a maximum of 2462 m²/g after CO2 activation.
• The pore structure of the activated graphitic nanoplatelets was successfully investigated.
• The process demonstrated effective etching and pore generation on the graphitic nanoplatelet structure.

Conclusions:

• CO2 activation at 900°C effectively creates porous graphitic nanoplatelets with enhanced surface area.
• This method offers a green chemistry alternative, utilizing CO2 from manufacturing to activation.
• The study highlights a sustainable pathway for producing advanced porous carbon materials.