Electrocatalytic CO₂ Upgrading to Biodegradable Plastic by Bromine-Assisted C₂H₄ Oxidation and Polymerization

Area of Science:

• Electrochemistry
• Polymer Science
• Sustainable Chemistry

Background:

• Electrochemical upgrading of carbon dioxide (CO2) to long-chain products is challenging due to complex pathways and slow carbon-carbon coupling.
• Ethylene (C2H4), a CO2 electroreduction product, offers potential for chain elongation but faces bottlenecks in efficient oxidation and selective control.
• Developing efficient methods for CO2 conversion into valuable materials is crucial for sustainability.

Purpose of the Study:

• To demonstrate an efficient tandem electrochemical approach for synthesizing polyglycolic acid (PGA) from CO2.
• To overcome the limitations of C2H4 oxidation and control for producing long-chain products.
• To present a novel pathway for converting CO2 into biodegradable polyesters.

Main Methods:

• A tandem electrochemical process involving bromine-assisted C2H4 oxidation.
• Temperature-mediated electro-oxidation of C2H4 to bromoacetate under ambient conditions.
• Mild polymerization of bromoacetate to polyglycolic acid (PGA).

Main Results:

• Successfully synthesized polyglycolic acid (PGA) from CO2 via a two-step electrochemical process.
• Enabled efficient C2H4 oxidation to bromoacetate by overcoming diffusion limitations.
• Achieved polymerization of bromoacetate through intermolecular nucleophilic attack.

Conclusions:

• The developed tandem electrochemical approach efficiently converts CO2 to PGA.
• This method overcomes key bottlenecks in C2H4 oxidation and selective control.
• Presents a promising route for producing biodegradable polyesters from CO2.