Anhydrous Liquid-Phase Exfoliation of Pristine Electrochemically Active GeS Nanosheets

David Lam, Kan Sheng Chen, Joohoon Kang, Xiaolong Liu, Mark C. Hersam*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Germanium sulfide (GeS) is an emerging layered material with high promise in its two-dimensional (2D) exfoliated form for energy storage applications. While liquid-phase exfoliation (LPE) has been utilized for the low-cost, scalable production of related 2D materials, it has not yet been demonstrated for GeS nanosheets due to its chemical instability in ambient conditions. Here, GeS LPE is achieved in anhydrous N-methyl-2-pyrrolidone using a customized sealed-tip sonication system, yielding sub-10 nm thick GeS nanosheets that are structurally pristine with minimal chemical degradation as revealed by atomic force microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. Lithium-ion battery anodes based on these high-quality GeS nanosheets possess superlative electrochemical performance including high cycling stability over 1000 cycles and high rate capability in excess of 10 A g-1. Overall, this work establishes a scalable LPE pathway for the production of pristine electrochemically active GeS nanosheets that are well-suited for high-power lithium-ion battery applications.

Original languageEnglish (US)
Pages (from-to)2245-2250
Number of pages6
JournalChemistry of Materials
Issue number7
StatePublished - Apr 10 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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