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The capture and storage of CO2, a major component of greenhouse gases, arecrucial steps that can positively impact the global carbon balance. The captureof CO2 has been difficult due to its extremely high stability. In this study,we propose a simple and yet effective approach for capture and storage of CO2by C6Li6. C6Li6 possesses a planar star-like structure, whose ionization energyis lower than that of Li atom and hence, it behaves as a superalkali.Superalkalis are unusual species possessing lower ionization energies thanalkali atoms. We have systematically studied the interaction of successive CO2molecules with C6Li6 using long-range dispersion corrected density functional{\omega}B97xD/6-311+G(d) calculations. We notice that these interactions leadto stable C6Li6-nCO2 complexes (n = 1-6) in which the structure of CO2 moietiesis bent appreciably (122-125deg) due to electron transfer from C6Li6, whoseplanarity is distorted only slightly (less than or equal to 7 deg). Thisclearly suggests that the CO2 molecules can successfully be activated andcaptured by C6Li6. We have also analyzed bond-lengths and bond-angle of CO2,their charges and adsorption energy as a function of the number of adsorbed CO2(n). It has been also noticed that the bond-length of CO2 in C6Li6-nCO2complexes increases monotonically whereas adsorption energy decreases, ranging3.18-2.79 eV per CO2 with the increase in n. These findings not only establishthe potential of C6Li6 for capture and storage of CO2 molecules but alsoprovide new insights into CO2-activation, capture, and storage by systemshaving low ionization energies.

CO2-Activation and Enhanced Capture by C6Li6: A Density Functional Approach