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Supercapacitive CO₂ Capture through a Scalable, Aqueous, Neutral Polymer-Based Electrolyte.

Daniel García-Giménez¹, Marta Santos-Rodríguez¹, Antoniou Maria-Anna¹

¹Institute of Polymer Science and Technology, ICTP, CSIC, 28006, Madrid, Spain.

|September 22, 2025

Summary

This summary is machine-generated.

Researchers developed advanced polymer electrolytes for electrochemical carbon dioxide (CO2) capture using slightly salty water and polyethylene glycol. This method significantly enhances CO2 adsorption capacity and energy storage in supercapacitor cells.

Keywords:

CO2 capture capacitors electrochemical cells energy storage polymer electrolyte

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Area of Science:

Electrochemistry
Materials Science
Environmental Science

Background:

Aqueous electrolytes present a safer, cost-effective, and scalable alternative for electrochemical carbon dioxide (CO2) capture.
Traditional methods often face limitations in efficiency, cost, or scalability.

Purpose of the Study:

To develop novel polymer electrolytes for enhanced CO2 capture using readily available materials.
To investigate the CO2 adsorption capacity and electrochemical performance of these new electrolytes in a supercapacitor cell.

Main Methods:

Development of electrolytes combining polyethylene glycol with slightly salty water.
Testing CO2 capture in a supercapacitor cell under various conditions (current density, voltage, temperature, pH).
Application of negative charge protocols to assess adsorption enhancement.

Main Results:

Achieved CO2 capture of up to 79 mmol/kg of electrode material at 2.5 V and 40°C.
Negative charge protocols increased adsorption to 356 mmol/kg, attributed to bicarbonate ion dynamics.
Demonstrated a threefold increase in gravimetric energy storage compared to devices operating at lower voltages.
Exhibited excellent stability and corrosion resistance during long-term cycling.

Conclusions:

Novel polymer electrolytes offer a highly efficient and stable platform for electrochemical CO2 capture.
The CO2 capture mechanism is independent of charge direction, offering flexibility in operation.
This technology represents a significant advancement in sustainable carbon capture solutions.