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Bivalence Mn5O8 with hydroxylated interphase for high-voltage aqueous sodium-ion storage

Author

Listed:
  • Xiaoqiang Shan

    (University of New Hampshire)

  • Daniel S. Charles

    (University of New Hampshire)

  • Yinkai Lei

    (University of Pittsburgh)

  • Ruimin Qiao

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • Guofeng Wang

    (University of Pittsburgh)

  • Wanli Yang

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • Mikhail Feygenson

    (Spallation Neutron Source, Oak Ridge National Laboratory)

  • Dong Su

    (Center for Functional Nanomaterials, Brookhaven National Laboratory)

  • Xiaowei Teng

    (University of New Hampshire)

Abstract

Aqueous electrochemical energy storage devices have attracted significant attention owing to their high safety, low cost and environmental friendliness. However, their applications have been limited by a narrow potential window (∼1.23 V), beyond which the hydrogen and oxygen evolution reactions occur. Here we report the formation of layered Mn5O8 pseudocapacitor electrode material with a well-ordered hydroxylated interphase. A symmetric full cell using such electrodes demonstrates a stable potential window of 3.0 V in an aqueous electrolyte, as well as high energy and power performance, nearly 100% coulombic efficiency and 85% energy efficiency after 25,000 charge–discharge cycles. The interplay between hydroxylated interphase on the surface and the unique bivalence structure of Mn5O8 suppresses the gas evolution reactions, offers a two-electron charge transfer via Mn2+/Mn4+ redox couple, and provides facile pathway for Na-ion transport via intra-/inter-layer defects of Mn5O8.

Suggested Citation

  • Xiaoqiang Shan & Daniel S. Charles & Yinkai Lei & Ruimin Qiao & Guofeng Wang & Wanli Yang & Mikhail Feygenson & Dong Su & Xiaowei Teng, 2016. "Bivalence Mn5O8 with hydroxylated interphase for high-voltage aqueous sodium-ion storage," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13370
    DOI: 10.1038/ncomms13370
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