CO2 Capture in Liquid Phase and Room–Temperature Release and Concentration Using Mechanical Power

Abstract

Development of advanced materials with high CO₂ capture capacity and, inter alia, superior regenerability with low energy consumption (low–temperature CO₂ release) remains highly desired yet challenging. Herein, we firstly report the precipitation–involved CO₂ capture from ultradilute sources (e.g., exhaled gas and indoor air) and the reversible room–temperature CO₂ release accelerated by mechanical power using a covalent organic superphane cage. This superphane based operating system enables CO₂ in ultradilute gas (< 6%) to be concentrated up to 83%. As inferred from the control experiments and theoretical calculations, this proof–of–concept CO₂ capture and concentration system with mechanical power–triggered CO₂ release by the discrete organic cage could be rationalized by the formation of a six–membered ring transition state with relatively low energy barrier during the process of the adsorption and desorption of CO₂ on the cage surface, along with the precipitation involved phase change.

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