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Phosphonate-based iron complex for a cost-effective and long cycling aqueous iron redox flow battery

Author

Listed:
  • Gabriel S. Nambafu

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

  • Aaron M. Hollas

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

  • Shuyuan Zhang

    (School of Polymer Science and Polymer Engineering, The University of Akron)

  • Peter S. Rice

    (Physical & Computational Science, Directorate, Pacific Northwest National Laboratory)

  • Daria Boglaienko

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

  • John L. Fulton

    (Physical & Computational Science, Directorate, Pacific Northwest National Laboratory)

  • Miller Li

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

  • Qian Huang

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

  • Yu Zhu

    (School of Polymer Science and Polymer Engineering, The University of Akron)

  • David M. Reed

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

  • Vincent L. Sprenkle

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

  • Guosheng Li

    (Energy & Environment Directorate, Pacific Northwest National Laboratory)

Abstract

A promising metal-organic complex, iron (Fe)-NTMPA2, consisting of Fe(III) chloride and nitrilotri-(methylphosphonic acid) (NTMPA), is designed for use in aqueous iron redox flow batteries. A full-cell testing, where a concentrated Fe-NTMPA2 anolyte (0.67 M) is paired with a Fe-CN catholyte, demonstrates exceptional cycling stability over 1000 charge/discharge cycles, and noteworthy performances, including 96% capacity utilization, a minimal capacity fade rate of 0.0013% per cycle (1.3% over 1,000 cycles), high Coulombic efficiency and energy efficiency near 100% and 87%, respectively, all achieved under a current density of 20 mA·cm-². Furthermore, density functional theory unveils two potential coordination structures for Fe-NTMPA2 complexes, improving the understanding between the ligand coordination environment and electron transfer kinetics. When paired with a high redox potential Fe-Dcbpy/CN catholyte, 2,2′-bipyridine-4,4′-dicarboxylic (Dcbpy) acid and cyanide (CN) ligands, Fe-NTMPA2 demonstrates a notably elevated cell voltage of 1 V, enabling a practical energy density of up to 9 Wh/L.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45862-3
    DOI: 10.1038/s41467-024-45862-3
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    References listed on IDEAS

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    2. Debra J. Davidson, 2019. "Exnovating for a renewable energy transition," Nature Energy, Nature, vol. 4(4), pages 254-256, April.
    3. Aaron Hollas & Xiaoliang Wei & Vijayakumar Murugesan & Zimin Nie & Bin Li & David Reed & Jun Liu & Vincent Sprenkle & Wei Wang, 2018. "A biomimetic high-capacity phenazine-based anolyte for aqueous organic redox flow batteries," Nature Energy, Nature, vol. 3(6), pages 508-514, June.
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