Battery-Based Carbon Capture May Use Less Energy, Study Says
A University of Delaware team led by James Buchen has demonstrated a battery-based carbon-capture technique that may use less energy and cost less than reversible-filter designs, Ars Technica reported.
Most equipment that captures carbon dioxide from ambient air or smokestacks works through a reversible filter. Air is passed through granules or a liquid that absorbs the CO2. The CO2-loaded substance then undergoes a process, usually heating, that causes it to release the gas. The resulting gas can be collected in a separated stream. A similar operation is possible on a smaller scale, such as inside a battery.
Ars Technica described the new study on Sept. 28, 2026. The study demonstrates an example of a battery-based electrochemical carbon-capture technique that the team says is more viable than previous attempts. The approach has the potential to require less energy, and therefore be cheaper, than the reversible-filter designs that currently dominate.
In a device of this type, hydroxide produced at the battery cathode reacts with CO2. The reaction converts CO2 into carbonate or bicarbonate, which passes through the separator membrane to the anode. There, the lower pH causes the reaction to reverse, and carbonate turns back into CO2 gas.
The cathode's role is to produce hydroxide ions. The anode's role is to consume them.