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Molecular engineering of dihydroxyanthraquinone-based electrolytes for high-capacity aqueous organic redox flow batteries

Author

Listed:
  • Shiqiang Huang

    (National University of Singapore)

  • Hang Zhang

    (National University of Singapore)

  • Manohar Salla

    (National University of Singapore)

  • Jiahao Zhuang

    (National University of Singapore)

  • Yongfeng Zhi

    (National University of Singapore)

  • Xun Wang

    (National University of Singapore)

  • Qing Wang

    (National University of Singapore
    National University of Singapore (Suzhou) Research Institute)

Abstract

Aqueous organic redox flow batteries (AORFBs) are a promising technology for large-scale electricity energy storage to realize efficient utilization of intermittent renewable energy. In particular, organic molecules are a class of metal-free compounds that consist of earth-abundant elements with good synthetic tunability, electrochemical reversibility and reaction rates. However, the short cycle lifetime and low capacity of AORFBs act as stumbling blocks for their practical deployment. To circumvent these issues, here, we report molecular engineered dihydroxyanthraquinone (DHAQ)-based alkaline electrolytes. Via computational studies and operando measurements, we initially demonstrate the presence of a hydrogen bond-mediated degradation mechanism of DHAQ molecules during electrochemical reactions. Afterwards, we apply a molecular engineering strategy based on redox-active polymers to develop capacity-boosting composite electrolytes. Indeed, by coupling a 1,5-DHAQ/poly(anthraquinonyl sulfide)/carbon black anolyte and a [Fe(CN)6]3−/4− alkaline catholyte, we report an AORFB capable of delivering a stable cell discharge capacity of about 573 mAh at 20 mA/cm2 after 1100 h of cycling and an average cell discharge voltage of about 0.89 V at the same current density.

Suggested Citation

  • Shiqiang Huang & Hang Zhang & Manohar Salla & Jiahao Zhuang & Yongfeng Zhi & Xun Wang & Qing Wang, 2022. "Molecular engineering of dihydroxyanthraquinone-based electrolytes for high-capacity aqueous organic redox flow batteries," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32424-8
    DOI: 10.1038/s41467-022-32424-8
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    References listed on IDEAS

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    1. Alen Vizintin & Jan Bitenc & Anja Kopač Lautar & Klemen Pirnat & Jože Grdadolnik & Jernej Stare & Anna Randon-Vitanova & Robert Dominko, 2018. "Probing electrochemical reactions in organic cathode materials via in operando infrared spectroscopy," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
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    Cited by:

    1. Dominik Emmel & Simon Kunz & Nick Blume & Yongchai Kwon & Thomas Turek & Christine Minke & Daniel Schröder, 2023. "Benchmarking organic active materials for aqueous redox flow batteries in terms of lifetime and cost," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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