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Atomic cobalt as an efficient electrocatalyst in sulfur cathodes for superior room-temperature sodium-sulfur batteries

Journal Article


Abstract


  • The low-cost room-temperature sodium-sulfur battery system is arousing extensive interest

    owing to its promise for large-scale applications. Although significant efforts have been made,

    resolving low sulfur reaction activity and severe polysulfide dissolution remains challenging.

    Here, a sulfur host comprised of atomic cobalt-decorated hollow carbon nanospheres is

    synthesized to enhance sulfur reactivity and to electrocatalytically reduce polysulfide into the

    final product, sodium sulfide. The constructed sulfur cathode delivers an initial reversible

    capacity of 1081 mA h g−1 with 64.7% sulfur utilization rate; significantly, the cell retained a

    high reversible capacity of 508 mA h g−1 at 100 mA g−1 after 600 cycles. An excellent rate

    capability is achieved with an average capacity of 220.3 mA h g−1 at the high current density

    of 5 A g−1

    . Moreover, the electrocatalytic effects of atomic cobalt are clearly evidenced by

    operando Raman spectroscopy, synchrotron X-ray diffraction, and density functional theory

Authors


  •   Lai, Weihong
  •   Zhang, Binwei (external author)
  •   Sheng, Tian (external author)
  •   Liu, Yundan (external author)
  •   Wang, Yunxiao
  •   Zhang, Lei (external author)
  •   Wang, Li (external author)
  •   Yang, Jianping (external author)
  •   Gu, Qinfen (external author)
  •   Chou, Shulei
  •   Liu, Hua K.
  •   Dou, Shi Xue

Publication Date


  • 2018

Citation


  • Zhang, B., Sheng, T., Liu, Y., Wang, Y., Zhang, L., Lai, W., Wang, L., Yang, J., Gu, Q., Chou, S., Liu, H. & Dou, S. (2018). Atomic cobalt as an efficient electrocatalyst in sulfur cathodes for superior room-temperature sodium-sulfur batteries. Nature Communications, 9 4082-1-4082-11.

Scopus Eid


  • 2-s2.0-85054450094

Start Page


  • 4082-1

End Page


  • 4082-11

Volume


  • 9

Place Of Publication


  • United Kingdom

Abstract


  • The low-cost room-temperature sodium-sulfur battery system is arousing extensive interest

    owing to its promise for large-scale applications. Although significant efforts have been made,

    resolving low sulfur reaction activity and severe polysulfide dissolution remains challenging.

    Here, a sulfur host comprised of atomic cobalt-decorated hollow carbon nanospheres is

    synthesized to enhance sulfur reactivity and to electrocatalytically reduce polysulfide into the

    final product, sodium sulfide. The constructed sulfur cathode delivers an initial reversible

    capacity of 1081 mA h g−1 with 64.7% sulfur utilization rate; significantly, the cell retained a

    high reversible capacity of 508 mA h g−1 at 100 mA g−1 after 600 cycles. An excellent rate

    capability is achieved with an average capacity of 220.3 mA h g−1 at the high current density

    of 5 A g−1

    . Moreover, the electrocatalytic effects of atomic cobalt are clearly evidenced by

    operando Raman spectroscopy, synchrotron X-ray diffraction, and density functional theory

Authors


  •   Lai, Weihong
  •   Zhang, Binwei (external author)
  •   Sheng, Tian (external author)
  •   Liu, Yundan (external author)
  •   Wang, Yunxiao
  •   Zhang, Lei (external author)
  •   Wang, Li (external author)
  •   Yang, Jianping (external author)
  •   Gu, Qinfen (external author)
  •   Chou, Shulei
  •   Liu, Hua K.
  •   Dou, Shi Xue

Publication Date


  • 2018

Citation


  • Zhang, B., Sheng, T., Liu, Y., Wang, Y., Zhang, L., Lai, W., Wang, L., Yang, J., Gu, Q., Chou, S., Liu, H. & Dou, S. (2018). Atomic cobalt as an efficient electrocatalyst in sulfur cathodes for superior room-temperature sodium-sulfur batteries. Nature Communications, 9 4082-1-4082-11.

Scopus Eid


  • 2-s2.0-85054450094

Start Page


  • 4082-1

End Page


  • 4082-11

Volume


  • 9

Place Of Publication


  • United Kingdom