A Mo5N6 electrocatalyst for efficient Na2S electrodeposition in room-temperature sodium-sulfur batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Chao Ye
  • Huanyu Jin
  • Yan Jiao
  • Huan Li
  • Qinfen Gu
  • Kenneth Davey
  • Haihui Wang
  • Shi-Zhang Qiao

Detail(s)

Original languageEnglish
Article number7195
Journal / PublicationNature Communications
Volume12
Online published10 Dec 2021
Publication statusPublished - 2021
Externally publishedYes

Link(s)

Abstract

Metal sulfides electrodeposition in sulfur cathodes mitigates the shuttle effect of polysulfides to achieve high Coulombic efficiency in secondary metal-sulfur batteries. However, fundamental understanding of metal sulfides electrodeposition and kinetics mechanism remains limited. Here using room-temperature sodium-sulfur cells as a model system, we report a Mo5N6 cathode material that enables efficient Na2S electrodeposition to achieve an initial discharge capacity of 512 mAh g−1 at a specific current of 1 675 mA g−1, and a final discharge capacity of 186 mAh g−1 after 10,000 cycles. Combined analyses from synchrotron-based spectroscopic characterizations, electrochemical kinetics measurements and density functional theory computations confirm that the high d-band position results in a low Na2S2 dissociation free energy for Mo5N6. This promotes Na2S electrodeposition, and thereby favours long-term cell cycling performance. © 2021, The Author(s).

Research Area(s)

Citation Format(s)

A Mo5N6 electrocatalyst for efficient Na2S electrodeposition in room-temperature sodium-sulfur batteries. / Ye, Chao; Jin, Huanyu; Shan, Jieqiong et al.
In: Nature Communications, Vol. 12, 7195, 2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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