New Battery Technology Shows Potential for Carbon Dioxide Capture

Researchers at the University of Delaware have demonstrated a novel battery-powered electrochemical technique for capturing carbon dioxide. The team's study suggests this method is more viable than previous attempts and holds the potential to require less energy, making it cheaper than current reversible filter designs.

Standard equipment for capturing carbon dioxide from ambient air or smokestacks typically employs reversible filters. These systems pass air through granules or a liquid that absorbs CO2. Subsequently, the CO2-loaded substance undergoes a process, usually heating, to release the captured gas, which is then collected.

The new approach utilizes a battery's electrochemical properties. The core principle involves hydroxide produced at the battery's cathode reacting with CO2 to form carbonate or bicarbonate. This compound then moves through a separator membrane to the anode. There, a lower pH reverses the reaction, converting the carbonate back into CO2 gas. The cathode's function is to generate hydroxide ions, while the anode consumes them.

This development could offer a more cost-effective pathway for removing CO2 from the atmosphere or industrial emissions, potentially contributing significantly to climate change mitigation efforts.