Electrochemical CO 2 Capture by a Quinone-Based Covalent Organic Framework

作者：Muhammad Abdullah Khan, Zhen Xu, Muhammad Muzammil, S.P. Bird, Monica Munawar, Fariah Salam, Niamh A. Hartley, Jack Taylor, Kamran Amin, Jianheng Ling, Henry R. N. B. Enninful, Naveed Zafar Ali, Kai Hetze, Sijia Cao, Yan Lü, Zhixiang Wei, Martin Oschatz, Phillip J. Milner, Alexander C. Forse · 发表于：Journal of the American Chemical Society · 年份：2025 · DOI：10.1021/jacs.5c12304 · 被引用次数：8 · 研究领域：Covalent Organic Framework Applications、CO2 Reduction Techniques and Catalysts、Carbon Dioxide Capture Technologies

High Resolution Image Download MS PowerPoint Slide Electrochemical CO 2 capture is an emerging technology that promises to be more energy-efficient than traditional thermal or pressure-swing processes. Herein, the first evidence of electrochemical capture of CO 2 using a covalent organic framework (COF) is presented. We hypothesized that the assembly of anthraquinone units into a well-defined porous framework electrode would lead to enhanced electrochemical CO 2 capture compared to previous approaches that grafted anthraquinones on carbon supports and suffered from low CO 2 capacities and stabilities. To test this, an anthraquinone-based COF is employed, and it is found that the quinones are electrochemically accessible for reversible CO 2 capture in an ionic liquid electrolyte. The system achieves a high electrochemical CO 2 uptake capacity >2.6 mmol g –1 COF, reaching half of the theoretical CO 2 capacity of the material and surpassing the capacities of anthraquinone-functionalized carbons. The stability and CO 2 uptake rate issues encountered with the ionic liquid system are also addressed by using aqueous electrolytes where we attained stable carbon capture for 500 cycles with a 99.6% Coulombic efficiency and an electrical energy consumption of 31 kJ mol CO 2 –1 . The use of covalent organic framework electrodes can become a general strategy for understanding and enhancing the electrochemical CO 2 capture.