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Anhydrous Liquid-Phase Exfoliation of Pristine Electrochemically Active GeS Nanosheets

Journal Article · · Chemistry of Materials
 [1];  [1];  [1];  [2];  [3]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
  2. Northwestern Univ., Evanston, IL (United States). Applied Physics Graduate Program
  3. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering; Northwestern Univ., Evanston, IL (United States). Applied Physics Graduate Program
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. Finally, 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.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Electrical Energy Storage (CEES)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1470441
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 7 Vol. 30; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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In-plane anisotropic electronics based on low-symmetry 2D materials: progress and prospects journal January 2020
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