First-principles study of χ3-borophene for charge-modulated switchable CO2 capture

Literature Information

Publication Date 2020-03-25
DOI 10.1039/D0CP01020K
Impact Factor 3.676
Authors

Wenwei Luo, Hewen Wang, Zhiqiang Wang, Gang Liu, Sanqiu Liu, Chuying Ouyang


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Abstract

A first-principles calculation was performed to investigate the switchable CO2 capture on χ3-borophene by injecting/removing the extra electrons. The results show that the CO2 adsorption energy on the neutral χ3-borophene is 0.150 eV. After extra 2.5 e are injected, the adsorption energy is raised up to 0.802 eV, showing a significant enhancement with the change from the physical adsorption to chemical adsorption. Furthermore, both the CO2 capture and release processes are exothermic reactions involving injecting/removing extra electrons. χ3-borophene possesses a metallic electronic structure, which is conducive to the injection of extra electrons. The minimum charge density for CO2 capture on the negatively charged χ3-borophene is 1.6 × 1014 e cm−2. The CO2 capture capacity of χ3-borophene is 4.09 × 1014 cm−2. Finally, we study the selectivity of negatively charged χ3-borophene. The results show that the negatively-charged χ3-borophene possesses a high selectivity for CO2 from its mixtures with CO, CH4, NH3, N2, H2S, and H2. χ3-borophene is a new promising charge-modulated switchable CO2 capture material with good stability, high CO2 capture capacity, high selectivity, and excellent electrical conductivity.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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