Dual‐Tuning Azole‐Based Ionic Liquids for Reversible CO2 Capture from Ambient Air

Abstract

AbstractA strategy of tuning azole‐based ionic liquids for reversible CO2 capture from ambient air was reported. Through tuning the basicity of anion as well as the type of cation, an ideal azole‐based ionic liquid with both high CO2 capacity and excellent stability was synthesized, which exhibited a highest single‐component isotherm uptake of 2.17 mmol/g at the atmospheric CO2 concentration of 0.4 mbar at 30 °C, even in the presence of water. The bound CO2 can be released by relatively mild heating of the IL‐CO2 at 80 °C, which makes it promising for energy‐efficient CO2 desorption and sorbent regeneration, leading to excellent reversibility. To the best of our knowledge, these azole‐based ionic liquids are superior to other adsorbent materials for direct air capture due to their dual‐tunable properties and high CO2 capture efficiency, offering a new prospect for efficient and reversible direct air capture technologies.