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Symmetry-breaking design of an organic iron complex catholyte for a long cyclability aqueous organic redox flow battery

Author

Listed:
  • Xiang Li

    (The University of Akron)

  • Peiyuan Gao

    (Pacific Northwest National Laboratory)

  • Yun-Yu Lai

    (The University of Akron)

  • J. David Bazak

    (Pacific Northwest National Laboratory)

  • Aaron Hollas

    (Pacific Northwest National Laboratory)

  • Heng-Yi Lin

    (The University of Akron
    National Yang Ming Chiao Tung University)

  • Vijayakumar Murugesan

    (Pacific Northwest National Laboratory)

  • Shuyuan Zhang

    (The University of Akron)

  • Chung-Fu Cheng

    (The University of Akron)

  • Wei-Yao Tung

    (The University of Akron)

  • Yueh-Ting Lai

    (The University of Akron)

  • Ruozhu Feng

    (Pacific Northwest National Laboratory)

  • Jin Wang

    (The University of Akron)

  • Chien-Lung Wang

    (National Yang Ming Chiao Tung University)

  • Wei Wang

    (Pacific Northwest National Laboratory)

  • Yu Zhu

    (The University of Akron)

Abstract

The limited availability of a high-performance catholyte has hindered the development of aqueous organic redox flow batteries (AORFB) for large-scale energy storage. Here we report a symmetry-breaking design of iron complexes with 2,2′-bipyridine-4,4′-dicarboxylic (Dcbpy) acid and cyanide ligands. By introducing two ligands to the metal centre, the complex compounds (M4[FeII(Dcbpy)2(CN)2], M = Na, K) exhibited up to a 4.2 times higher solubility (1.22 M) than that of M4[FeII(Dcbpy)3] and a 50% increase in potential compared with that of ferrocyanide. The AORFBs with 0.1 M Na4[FeII(Dcbpy)2(CN)2] as the catholyte were demonstrated for 6,000 cycles with a capacity fading rate of 0.00158% per cycle (0.217% per day). Even at a concentration near the solubility limit (1 M Na4[FeII(Dcbpy)2(CN)2]), the flow battery exhibited a capacity fading rate of 0.008% per cycle (0.25% per day) in the first 400 cycles. The AORFB cell with a nearly 1:1 catholyte:anolyte electron ratio achieved a cell voltage of 1.2 V and an energy density of 12.5 Wh l–1.

Suggested Citation

  • Xiang Li & Peiyuan Gao & Yun-Yu Lai & J. David Bazak & Aaron Hollas & Heng-Yi Lin & Vijayakumar Murugesan & Shuyuan Zhang & Chung-Fu Cheng & Wei-Yao Tung & Yueh-Ting Lai & Ruozhu Feng & Jin Wang & Chi, 2021. "Symmetry-breaking design of an organic iron complex catholyte for a long cyclability aqueous organic redox flow battery," Nature Energy, Nature, vol. 6(9), pages 873-881, September.
    • Handle: RePEc:nat:natene:v:6:y:2021:i:9:d:10.1038_s41560-021-00879-6
    DOI: 10.1038/s41560-021-00879-6
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    Cited by:

    1. Gabriel S. Nambafu & Aaron M. Hollas & Shuyuan Zhang & Peter S. Rice & Daria Boglaienko & John L. Fulton & Miller Li & Qian Huang & Yu Zhu & David M. Reed & Vincent L. Sprenkle & Guosheng Li, 2024. "Phosphonate-based iron complex for a cost-effective and long cycling aqueous iron redox flow battery," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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