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Redox-tunable Lewis bases for electrochemical carbon dioxide capture

Author

Listed:
  • Xing Li

    (Johns Hopkins University)

  • Xunhua Zhao

    (The University of Texas at Austin
    The University of Texas at Austin)

  • Yuanyue Liu

    (The University of Texas at Austin
    The University of Texas at Austin)

  • T. Alan Hatton

    (Massachusetts Institute of Technology)

  • Yayuan Liu

    (Johns Hopkins University
    Massachusetts Institute of Technology)

Abstract

Carbon capture is considered a critical means for climate change mitigation. However, conventional wet chemical scrubbing utilizing sp3 amines suffers from high energy consumption, corrosion and sorbent degradation, motivating the search for more efficient carbon dioxide separation strategies. Here, we demonstrate a library of redox-tunable Lewis bases with sp2-nitrogen centres that can reversibly capture and release carbon dioxide through an electrochemical cycle. The mechanism of the carbon capture process is elucidated via a combined experimental and computational approach. We show that the properties of these Lewis base sorbents can be fine-tuned via molecular design and electrolyte engineering. Moreover, we identify a bifunctional azopyridine base that holds promise for electrochemically mediated carbon capture, exhibiting >85% capacity utilization efficiency over cycling in a flow system under 15% carbon dioxide with 5% oxygen. This work broadens the structural scope of redox-active carbon dioxide sorbents and provides design guidelines on molecules with tunable basicity under electrochemical conditions.

Suggested Citation

  • Xing Li & Xunhua Zhao & Yuanyue Liu & T. Alan Hatton & Yayuan Liu, 2022. "Redox-tunable Lewis bases for electrochemical carbon dioxide capture," Nature Energy, Nature, vol. 7(11), pages 1065-1075, November.
  • Handle: RePEc:nat:natene:v:7:y:2022:i:11:d:10.1038_s41560-022-01137-z
    DOI: 10.1038/s41560-022-01137-z
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    Cited by:

    1. Wu, Xiaomei & Mao, Yuanhao & Fan, Huifeng & Sultan, Sayd & Yu, Yunsong & Zhang, Zaoxiao, 2023. "Investigation on the performance of EDA-based blended solvents for electrochemically mediated CO2 capture," Applied Energy, Elsevier, vol. 349(C).
    2. Zhen Xu & Grace Mapstone & Zeke Coady & Mengnan Wang & Tristan L. Spreng & Xinyu Liu & Davide Molino & Alexander C. Forse, 2024. "Enhancing electrochemical carbon dioxide capture with supercapacitors," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    3. Xing Li & Xunhua Zhao & Lingyu Zhang & Anmol Mathur & Yu Xu & Zhiwei Fang & Luo Gu & Yuanyue Liu & Yayuan Liu, 2024. "Redox-tunable isoindigos for electrochemically mediated carbon capture," Nature Communications, Nature, vol. 15(1), pages 1-13, December.

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