Researchers develop battery-based system that captures CO₂ with lower energy use
A team led by James Buchen at the University of Delaware has created a battery-style device that absorbs carbon dioxide from air or exhaust streams using less energy than traditional filter methods.
Scientists headed by James Buchen at the University of Delaware have demonstrated a novel electrochemical method for capturing carbon dioxide. The device uses nickel-hydroxide electrodes, similar to those in older rechargeable batteries, to produce hydroxide ions that bind CO₂ as carbonate or bicarbonate at the cathode. These ions cross a membrane to the anode, where an acidic environment triggers the release of CO₂ gas, which can be collected separately.
The system functions like a reversible chemical seesaw: applying voltage in one direction creates hydroxide, while reversing the voltage swaps the electrode roles and releases the captured gas. Because the process avoids the high-temperature regeneration step of conventional filters, it may require less electricity and lower operating costs. The study suggests the technology could be scaled for use with ambient air or industrial smokestacks.
Why it matters
A lower-energy CO₂ capture method could make climate mitigation more affordable and scalable.
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