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In situ mapping of activity distribution and oxygen evolution reaction in vanadium flow batteries

Author

Listed:
  • Kaijie Ma

    (Tsinghua University
    Tsinghua University
    Tsinghua University)

  • Yunong Zhang

    (Tsinghua University)

  • Le Liu

    (Tsinghua University)

  • Jingyu Xi

    (Tsinghua University)

  • Xinping Qiu

    (Tsinghua University)

  • Tian Guan

    (Tsinghua University)

  • Yonghong He

    (Tsinghua University
    Tsinghua University)

Abstract

Understanding spatial distribution difference and reaction kinetics of the electrode is vital for enhancing the electrochemical reaction efficiency. Here, we report a total internal reflection imaging sensor without background current interference to map local current distribution of the electrode in a vanadium redox flow battery during cyclic voltammetry (CV), enabling mapping of the activity and reversibility distribution with the spatial resolution of a single fiber. Three graphite felts with different activity are compared to verify its feasibility. In long-term cyclic voltammetry, the oxygen evolution reaction is proved to enhance activity distribution, and homogeneity of the electrode and its bubble kinetics with periodic fluctuation is consistent with the cyclic voltammetry curve, enabling the onset oxygen evolution/reduction potential determination. Higher activity and irreversibility distribution of the electrode is found in favor of the oxygen evolution reaction. This sensor has potential to detect in situ, among other processes, electrochemical reactions in flow batteries, water splitting, electrocatalysis and electrochemical corrosion.

Suggested Citation

  • Kaijie Ma & Yunong Zhang & Le Liu & Jingyu Xi & Xinping Qiu & Tian Guan & Yonghong He, 2019. "In situ mapping of activity distribution and oxygen evolution reaction in vanadium flow batteries," Nature Communications, Nature, vol. 10(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13147-9
    DOI: 10.1038/s41467-019-13147-9
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    Cited by:

    1. Heming Liu & Ruikuan Xie & Yuting Luo & Zhicheng Cui & Qiangmin Yu & Zhiqiang Gao & Zhiyuan Zhang & Fengning Yang & Xin Kang & Shiyu Ge & Shaohai Li & Xuefeng Gao & Guoliang Chai & Le Liu & Bilu Liu, 2022. "Dual interfacial engineering of a Chevrel phase electrode material for stable hydrogen evolution at 2500 mA cm−2," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Pengfei Zhang & Lei Zhou & Rui Wang & Xinyu Zhou & Jiapei Jiang & Zijian Wan & Shaopeng Wang, 2022. "Evanescent scattering imaging of single protein binding kinetics and DNA conformation changes," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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