title: Reversible CO2 Capture by Conjugated Ionic Liquids through Dynamic Covalent Carbon-Oxygen Bonds.
abstract: The strong chemisorption of CO2 is always accompanied by a high absorption enthalpy, and traditional methods to reduce the absorption enthalpy lead to decreased CO2 capacities. Through the introduction of a large π-conjugated structure into the anion, a dual-tuning approach for the improvement of CO2 capture by anion-functionalized ionic liquids (ILs) resulted in a high capacity of up to 0.96 molCO2  mol-1IL and excellent reversibility. The increased capacity and improved desorption were supported by quantum chemical calculations, spectroscopic investigations, and thermogravimetric analysis. The increased capacity may be a result of the strengthened dynamic covalent bonds in these π-electron-conjugated structures through anion aggregation upon the uptake of CO2 , and the improved desorption originates from the charge dispersion of interaction sites through the large π-electron delocalization. These results provide important insights into effective strategies for CO2 capture.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Mingguang
authors.initials: M
authors.lastname: Pan
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Ningning
authors.initials: N
authors.lastname: Cao
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Lin
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Luo
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Kaihong
authors.initials: K
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Siying
authors.initials: S
authors.lastname: Che
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Haoran
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China. chewcm@zju.edu.cn.
authors.forename: Congmin
authors.initials: C
authors.lastname: Wang
mesh_terms: D065966:Absorption, Physicochemical; D002244:Carbon / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013696:Temperature
chemical_list: D052578:Ionic Liquids; D002245:Carbon Dioxide; D002244:Carbon; D010100:Oxygen
keywords: anions; carbon storage; chemisorption; conjugation; ionic liquids