Selective CO2 Capture and Collection Using Electronically Excited-States: A Theoretical Study 


Vol. 69,  No. 3, pp. 91-98, Jun.  2025
10.5012/jkcs.2025.69.3.91


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  Abstract

We release approximately 45 gigatons (Gt) of CO2 into the atmosphere annually, a figure projected to rise to about 50 Gt within the next decade. Conventional CO2 capture methods primarily utilize amine-based solutions, ionic liquids, solid adsorbents, photocatalysts and/or electrocatalysts. These methods, however, may fall short of the goal to limit cumulative CO2 emissions to 1,000 Gt by 2050. Here, we introduce a novel technique for selective CO2 adsorption on copper (Cu) surfaces, enabling low-energy CO2 collection. The results of this study indicate that electronically exciting H2O and CO2 transforms excited H2O into a non-polar species, which is difficult to adsorb onto the Cu surface, whereas excited CO2 becomes a polar species with strong adsorption affinity. Thus, excited CO2 can form stable complexes with Cu, while excited H2O demonstrates minimal adsorp- tion. Then, by stopping the light irradiation and applying a current of appropriate voltage to ionize Cu into Cu2+ and Cu2–, it is expected that CO2 can be quickly and easily desorbed from the complex. This approach suggests that selective and efficient CO₂ capture and collection from flue gas may be feasible by electronically exciting H₂O and CO₂ in the flue gas and adsorbing them onto the Cu surface.

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  Cite this article

[IEEE Style]

M. Lee, "Selective CO2 Capture and Collection Using Electronically Excited-States: A Theoretical Study," Journal of the Korean Chemical Society, vol. 69, no. 3, pp. 91-98, 2025. DOI: 10.5012/jkcs.2025.69.3.91.

[ACM Style]

Min-Joo Lee. 2025. Selective CO2 Capture and Collection Using Electronically Excited-States: A Theoretical Study. Journal of the Korean Chemical Society, 69, 3, (2025), 91-98. DOI: 10.5012/jkcs.2025.69.3.91.

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ISSN(Print) 1017-2548
ISSN(Online) 2234-8530