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University of Delaware team develops battery-based carbon capture device
Key points
- New electrochemical carbon-capture technique developed.
- Uses a battery-like device with nickel hydroxide electrodes.
- Converts CO2 to carbonate/bicarbonate, then back to CO2 gas.
- Potentially more energy-efficient and cheaper than current methods.
New Carbon Capture Approach
A team led by James Buchen of the University of Delaware has introduced a novel electrochemical carbon-capture technique. This method utilizes a battery-based device to capture carbon dioxide, differing from traditional reversible-filter systems.
Mechanism of Operation
The device operates by producing hydroxide at the cathode, which reacts with CO2 to form carbonate or bicarbonate. These then pass through a separator membrane to the anode. At the anode, a lower pH reverses the reaction, converting carbonate back into CO2 gas for collection. The cathode produces hydroxide ions, and the anode consumes them.
Electrode Composition
Both the cathode and anode in this device are made of nickel hydroxide, similar to the cathode material found in older nickel-metal hydride batteries. Unlike a conventional energy-storing battery, this system functions as a chemical seesaw, driving chemical reactions to capture and release CO2 by alternating voltage.
Potential Advantages
The researchers suggest this battery-based approach could be more viable than previous attempts. It has the potential to require less energy, which would lead to lower operational costs compared to the currently dominant reversible-filter designs for carbon capture.
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Reporting from
Researchers at the University of Delaware have developed a new electrochemical carbon-capture technique using a battery-like device. This method aims to reduce energy consumption and cost compared to existing reversible-filter designs for carbon dioxide capture.