New electrode captures CO2 from air and converts it directly into formic acid under real-world conditions.
Researchers in South Korea have created a new type of electrode that captures carbon dioxide from exhaust gases and converts it directly into formic acid . The device works under realistic gas conditions, offering a practical step toward industrial carbon reuse.
Carbon dioxide from home furnaces, fireplaces, and industrial facilities contributes significantly to air pollution. Existing carbon capture and conversion technologies typically require separate steps, with CO₂ concentrated before it can be converted into useful chemicals.“This work shows that carbon capture and conversion do not need to be treated as separate steps. By integrating both functions into a single electrode, we demonstrate a simpler pathway for CO2 utilization under realistic gas conditions,” said Wonyong Choi, corresponding author of the study.The new electrode can operate efficiently in mixed gases similar to those found in industrial flue emissions, including nitrogen and oxygen. It also works at CO₂ concentrations comparable to ambient air, making it versatile for multiple applications.Integrated CO2 capture systemThe electrode consists of three layers: a CO₂-absorbing material, a gas-permeable carbon paper sheet, and a catalytic layer of tin oxide. This configuration allows gas to pass through the electrode, trapping carbon dioxide and converting it simultaneously into formic acid.Formic acid has wide industrial applications, including use in fuel cells. Producing it directly from exhaust gases could make carbon capture more practical and cost-effective, reducing the need for complex and energy-intensive separation steps.In tests, the electrode outperformed existing technologies. When exposed to pure CO₂, it showed about 40 percent higher efficiency than traditional electrodes. Under simulated flue gas conditions containing 15 percent CO₂, 8 percent oxygen, and 77 percent nitrogen, the new system continued to produce significant amounts of formic acid while other systems performed poorly.Real-world carbon conversionThe device demonstrates that integrated capture and conversion can work outside controlled laboratory conditions. Researchers note that similar electrode designs could eventually be adapted to other greenhouse gases, including methane.“This approach offers a promising path toward integrating carbon capture into real industrial applications,” the team said. The technology is scalable and could reduce the complexity and cost of implementing CO₂ conversion in existing facilities.Funding for the research came from the National Research Foundation of Korea. The findings were published in ACS Energy Letters.
CO2 Conversion Electrode Flue Gas Formic Acid Greenhouse Gases Industrial Application Sustainable Technology
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