Electrochemical CO <sub>2</sub> Capture by a Quinone-Based Covalent Organic Framework

Electrochemical CO<sub>2</sub> 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<sub>2</sub> 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<sub>2</sub> capture compared to previous approaches that grafted anthraquinones on carbon supports and suffered from low CO<sub>2</sub> 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<sub>2</sub> capture in an ionic liquid electrolyte. The system achieves a high electrochemical CO<sub>2</sub> uptake capacity >2.6 mmol g<sup>-1</sup> COF, reaching half of the theoretical CO<sub>2</sub> capacity of the material and surpassing the capacities of anthraquinone-functionalized carbons. The stability and CO<sub>2</sub> 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<sub>CO<sub>2</sub></sub><sup>-1</sup>. The use of covalent organic framework electrodes can become a general strategy for understanding and enhancing the electrochemical CO<sub>2</sub> capture.

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Publication Details

Journal
Journal of the American Chemical Society
Published
2025-12-09
DOI
https://doi.org/10.1021/jacs.5c12304
Citations
1
Primary Topic
Covalent Organic Framework Applications
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article
Field-Weighted Citation Impact
0.52
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article

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

Henry R. N. B. Enninful, Phillip J. Milner, Alexander C. Forse, Zhen Xu et al.
1 citations
Journal of the American Chemical Society
Covalent Organic Framework Applications
0.52
article

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

Henry R. N. B. Enninful, Phillip J. Milner, Alexander C. Forse, Zhen Xu, Munawar Ali Munawar, Zhixiang Wei, Yan Qing Lu, Niamh A. Hartley, Muhammad Muzammil, Sijia Cao, Jianheng Ling, Martin Oschatz, Kamran Amin, Muhammad Abdullah Khan, Jack Taylor, Naveed Zafar Ali, Fariah Salam, S.P. Bird, Kai Hetze
article en
1 citations

Abstract

Electrochemical CO<sub>2</sub> 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<sub>2</sub> 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<sub>2</sub> capture compared to previous approaches that grafted anthraquinones on carbon supports and suffered from low CO<sub>2</sub> 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<sub>2</sub> capture in an ionic liquid electrolyte. The system achieves a high electrochemical CO<sub>2</sub> uptake capacity >2.6 mmol g<sup>-1</sup> COF, reaching half of the theoretical CO<sub>2</sub> capacity of the material and surpassing the capacities of anthraquinone-functionalized carbons. The stability and CO<sub>2</sub> 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<sub>CO<sub>2</sub></sub><sup>-1</sup>. The use of covalent organic framework electrodes can become a general strategy for understanding and enhancing the electrochemical CO<sub>2</sub> capture.

Journal of the American Chemical SocietyVol. 147(51)
Quaid-i-Azam University (PK), Helmholtz Institute Jena (DE), Chinese Academy of Sciences (CN), Cornell University (US), University of Cambridge (GB), Helmholtz-Zentrum Berlin für Materialien und Energie (DE), University of Manchester (GB), Renewable Energy Systems (United States) (US), Abdus Salam Centre for Physics (PK), National Center for Nanoscience and Technology (CN), Friedrich Schiller University Jena (DE), Leipzig University (DE)
Openalex Percentile: Top 30%
Covalent Organic Framework Applications
0.52
DOIOpen Access PDFOpenAlex
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