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Heteropoly acid negolytes for high-power-density aqueous redox flow batteries at low temperatures

Author

Listed:
  • Fei Ai

    (The Chinese University of Hong Kong)

  • Zengyue Wang

    (The Chinese University of Hong Kong)

  • Nien-Chu Lai

    (The Chinese University of Hong Kong)

  • Qingli Zou

    (The Chinese University of Hong Kong)

  • Zhuojian Liang

    (The Chinese University of Hong Kong)

  • Yi-Chun Lu

    (The Chinese University of Hong Kong)

Abstract

Operating aqueous redox flow batteries (ARFBs) at low temperatures is prohibited by limited solubility of redox-active materials, freezing electrolytes and sluggish reaction kinetics. Here we report a multi-electron heteropoly acid (H6P2W18O62, HPOM) negolyte that enables high-performance ARFBs at low temperatures. The proton (H+) in HPOM warrants a much higher solubility of polyoxometalates (POMs) (0.74 M at 25 °C and 0.5 M at −20 °C) compared with other cations (Li+/Na+/K+) owing to the strong solvation shell of H+ preventing precipitation. The HPOM also exhibits an exceptionally low freezing point and high conductivity owing to its high solubility and Grotthuss proton-conduction mechanism. These merits warrant HPOM as an ideal POM candidate for high-power-density low-temperature ARFB applications. Using a 0.5 M HPOM electrolyte, the ARFBs demonstrate power density (282.4 mW cm−2) and stability (79.6 Ah l−1negolyte at 160 mA cm−2 over 1,200 h without decay) at −20 °C, showing promising application potential under cold weather conditions.

Suggested Citation

  • Fei Ai & Zengyue Wang & Nien-Chu Lai & Qingli Zou & Zhuojian Liang & Yi-Chun Lu, 2022. "Heteropoly acid negolytes for high-power-density aqueous redox flow batteries at low temperatures," Nature Energy, Nature, vol. 7(5), pages 417-426, May.
    • Handle: RePEc:nat:natene:v:7:y:2022:i:5:d:10.1038_s41560-022-01011-y
    DOI: 10.1038/s41560-022-01011-y
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