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Enhancing electrochemical carbon dioxide capture with supercapacitors

Author

Listed:
  • Zhen Xu

    (University of Cambridge)

  • Grace Mapstone

    (University of Cambridge)

  • Zeke Coady

    (University of Cambridge)

  • Mengnan Wang

    (Imperial College London)

  • Tristan L. Spreng

    (University of Cambridge)

  • Xinyu Liu

    (University of Cambridge)

  • Davide Molino

    (University of Cambridge
    Dipartimento di Scienza Applicata e Tecnologia (DISAT))

  • Alexander C. Forse

    (University of Cambridge)

Abstract

Supercapacitors are emerging as energy-efficient and robust devices for electrochemical CO2 capture. However, the impacts of electrode structure and charging protocols on CO2 capture performance remain unclear. Therefore, this study develops structure-property-performance correlations for supercapacitor electrodes at different charging conditions. We find that electrodes with large surface areas and low oxygen functionalization generally perform best, while a combination of micro- and mesopores is important to achieve fast CO2 capture rates. With these structural features and tunable charging protocols, YP80F activated carbon electrodes show the best CO2 capture performance with a capture rate of 350 mmolCO2 kg–1 h–1 and a low electrical energy consumption of 18 kJ molCO2–1 at 300 mA g–1 under CO2, together with a long lifetime over 12000 cycles at 150 mA g–1 under CO2 and excellent CO2 selectivity over N2 and O2. Operated in a “positive charging mode”, the system achieves excellent electrochemical reversibility with Coulombic efficiencies over 99.8% in the presence of approximately 15% O2, alongside stable cycling performance over 1000 cycles. This study paves the way for improved supercapacitor electrodes and charging protocols for electrochemical CO2 capture.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52219-3
    DOI: 10.1038/s41467-024-52219-3
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    References listed on IDEAS

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