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Low energy carbon capture via electrochemically induced pH swing with electrochemical rebalancing

Author

Listed:
  • Shijian Jin

    (Harvard University)

  • Min Wu

    (Harvard University)

  • Yan Jing

    (Harvard University)

  • Roy G. Gordon

    (Harvard University
    Harvard University)

  • Michael J. Aziz

    (Harvard University)

Abstract

We demonstrate a carbon capture system based on pH swing cycles driven through proton-coupled electron transfer of sodium (3,3′-(phenazine-2,3-diylbis(oxy))bis(propane-1-sulfonate)) (DSPZ) molecules. Electrochemical reduction of DSPZ causes an increase of hydroxide concentration, which absorbs CO2; subsequent electrochemical oxidation of the reduced DSPZ consumes the hydroxide, causing CO2 outgassing. The measured electrical work of separating CO2 from a binary mixture with N2, at CO2 inlet partial pressures ranging from 0.1 to 0.5 bar, and releasing to a pure CO2 exit stream at 1.0 bar, was measured for electrical current densities of 20–150 mA cm−2. The work for separating CO2 from a 0.1 bar inlet and concentrating into a 1 bar exit is 61.3 kJ molCO2−1 at a current density of 20 mA cm−2. Depending on the initial composition of the electrolyte, the molar cycle work for capture from 0.4 mbar extrapolates to 121–237 kJ molCO2−1 at 20 mA cm−2. We also introduce an electrochemical rebalancing method that extends cell lifetime by recovering the initial electrolyte composition after it is perturbed by side reactions. We discuss the implications of these results for future low-energy electrochemical carbon capture devices.

Suggested Citation

  • Shijian Jin & Min Wu & Yan Jing & Roy G. Gordon & Michael J. Aziz, 2022. "Low energy carbon capture via electrochemically induced pH swing with electrochemical rebalancing," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29791-7
    DOI: 10.1038/s41467-022-29791-7
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    References listed on IDEAS

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    1. Yayuan Liu & Hong-Zhou Ye & Kyle M. Diederichsen & Troy Van Voorhis & T. Alan Hatton, 2020. "Electrochemically mediated carbon dioxide separation with quinone chemistry in salt-concentrated aqueous media," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
    2. Xie, Heping & Wu, Yifan & Liu, Tao & Wang, Fuhuan & Chen, Bin & Liang, Bin, 2020. "Low-energy-consumption electrochemical CO2 capture driven by biomimetic phenazine derivatives redox medium," Applied Energy, Elsevier, vol. 259(C).
    3. Ibadillah A. Digdaya & Ian Sullivan & Meng Lin & Lihao Han & Wen-Hui Cheng & Harry A. Atwater & Chengxiang Xiang, 2020. "A direct coupled electrochemical system for capture and conversion of CO2 from oceanwater," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    4. Flavien M. Brethomé & Neil J. Williams & Charles A. Seipp & Michelle K. Kidder & Radu Custelcean, 2018. "Direct air capture of CO2 via aqueous-phase absorption and crystalline-phase release using concentrated solar power," Nature Energy, Nature, vol. 3(7), pages 553-559, July.
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    Cited by:

    1. 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.
    2. Hyowon Seo & T. Alan Hatton, 2023. "Electrochemical direct air capture of CO2 using neutral red as reversible redox-active material," Nature Communications, Nature, vol. 14(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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