Make Carbonate, Then Undo It: the Battery Route to Carbon Capture

A carbon-capture device doesn't have to work like a filter. In the battery-based approach Ars Technica describes, hydroxide produced at the battery's cathode reacts with carbon dioxide, converting it into carbonate or bicarbonate. Those ions then pass through a separator membrane to the anode, where the lower pH reverses the reaction, turning the carbonate back into CO2 gas. Capture on one side of the membrane, release on the other.