Anhydrous Liquid-Phase Exfoliation of Pristine Electrochemically Active GeS Nanosheets

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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
Pages (from-to)2245-2250
Number of pages6
JournalChemistry of Materials
Volume30
Issue number7
DOIs
Publication statusPublished - Apr 10 2018

Fingerprint

Germanium
Nanosheets
Sulfides
Liquids
Sonication
Energy storage
Raman spectroscopy
Atomic force microscopy
Anodes
X ray photoelectron spectroscopy
Transmission electron microscopy
Degradation
Costs

ASJC Scopus subject areas

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

Cite this

Anhydrous Liquid-Phase Exfoliation of Pristine Electrochemically Active GeS Nanosheets. / Lam, David; Chen, Kan Sheng; Kang, Joohoon; Liu, Xiaolong; Hersam, Mark C.

In: Chemistry of Materials, Vol. 30, No. 7, 10.04.2018, p. 2245-2250.

Research output: Contribution to journalArticle

Lam, David ; Chen, Kan Sheng ; Kang, Joohoon ; Liu, Xiaolong ; Hersam, Mark C. / Anhydrous Liquid-Phase Exfoliation of Pristine Electrochemically Active GeS Nanosheets. In: Chemistry of Materials. 2018 ; Vol. 30, No. 7. pp. 2245-2250.
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