Covalent encapsulation of sulfur in a graphene/N-doped carbon host for enhanced 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)

  • Peng Hu
  • Yifei Wu
  • Xuming Yang
  • Na Li
  • Hongkang Wang
  • Jianfeng Jia

Detail(s)

Original languageEnglish
Article number136257
Journal / PublicationChemical Engineering Journal
Volume443
Online published9 Apr 2022
Publication statusPublished - 1 Sep 2022

Abstract

Application of emerging room temperature sodium-sulfur (RT Na-S) battery is restrained by the poor conductivity, volume expansion of sulfur cathode and the shuttle effect of soluble polysulfides in electrolytes. Herein, an N-doped two-dimensional (2D) carbon host was derived from the polydopamine coated graphene for sulfur storage. Different from the conventional used melt-diffusion method to integrate sulfur on graphene layer physically, we employed a vapor-infiltration method to realize the homogenous incorporation of sulfur in the graphene-based host via C-Sx-C bond. A polydopamine-derived N-doped carbon layer was further coated on graphene to confine the high-temperature-induced gas-phase sulfur, which effectively increase the covalently bonded sulfur content in the host. Moreover, based on Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) measurement, the C-S bonds are mainly formed beside N-doped carbon, being well explained by the stronger interaction between N-doped carbon and S4 (sulfur vapor) than that of pure carbon from density functional theory (DFT) calculation results. When tested as a cathode for RT Na-S battery, the obtained N-doped graphene/sulfur cathode shows superior cycle stability.

Research Area(s)

  • Covalent-bonded sulfur, Graphene, N-doped carbon matrix, Room temperature sodium-sulfur battery, Vapor-infiltration method

Citation Format(s)

Covalent encapsulation of sulfur in a graphene/N-doped carbon host for enhanced sodium-sulfur batteries. / Hu, Peng; Xiao, Fengping; Wu, Yifei; Yang, Xuming; Li, Na; Wang, Hongkang; Jia, Jianfeng.

In: Chemical Engineering Journal, Vol. 443, 136257, 01.09.2022.

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