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Highly active nanostructured CoS2/CoS heterojunction electrocatalysts for aqueous polysulfide/iodide redox flow batteries

Author

Listed:
  • Dui Ma

    (Shanghai Jiao Tong University)

  • Bo Hu

    (Utah State University)

  • Wenda Wu

    (Utah State University)

  • Xi Liu

    (Shanghai Jiao Tong University)

  • Jiantao Zai

    (Shanghai Jiao Tong University)

  • Chen Shu

    (Shanghai Jiao Tong University)

  • Tsegaye Tadesse Tsega

    (Shanghai Jiao Tong University)

  • Liwei Chen

    (Chinese Academy of Sciences)

  • Xuefeng Qian

    (Shanghai Jiao Tong University)

  • T. Leo Liu

    (Utah State University)

Abstract

Aqueous polysulfide/iodide redox flow batteries are attractive for scalable energy storage due to their high energy density and low cost. However, their energy efficiency and power density are usually limited by poor electrochemical kinetics of the redox reactions of polysulfide/iodide ions on graphite electrodes, which has become the main obstacle for their practical applications. Here, CoS2/CoS heterojunction nanoparticles with uneven charge distribution, which are synthesized in situ on graphite felt by a one-step solvothermal process, can significantly boost electrocatalytic activities of I−/I3− and S2−/Sx2− redox reactions by improving absorptivity of charged ions and promoting charge transfer. The polysulfide/iodide flow battery with the graphene felt-CoS2/CoS heterojunction can deliver a high energy efficiency of 84.5% at a current density of 10 mA cm−2, a power density of 86.2 mW cm−2 and a stable energy efficiency retention of 96% after approximately 1000 h of continuous operation.

Suggested Citation

  • Dui Ma & Bo Hu & Wenda Wu & Xi Liu & Jiantao Zai & Chen Shu & Tsegaye Tadesse Tsega & Liwei Chen & Xuefeng Qian & T. Leo Liu, 2019. "Highly active nanostructured CoS2/CoS heterojunction electrocatalysts for aqueous polysulfide/iodide redox flow batteries," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11176-y
    DOI: 10.1038/s41467-019-11176-y
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    Cited by:

    1. Yuhua Xia & Mengzheng Ouyang & Vladimir Yufit & Rui Tan & Anna Regoutz & Anqi Wang & Wenjie Mao & Barun Chakrabarti & Ashkan Kavei & Qilei Song & Anthony R. Kucernak & Nigel P. Brandon, 2022. "A cost-effective alkaline polysulfide-air redox flow battery enabled by a dual-membrane cell architecture," Nature Communications, Nature, vol. 13(1), pages 1-13, December.

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