Journal
CHEMISTRY OF MATERIALS
Volume 30, Issue 7, Pages 2245-2250Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b04652
Keywords
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Funding
- National Science Foundation [DMR-1505849]
- Center for Electrochemical Energy Science, an Energy Frontier Research Center - US Department of Energy, Office of Science, Basic Energy Sciences [DE-AC02-06CH11357]
- NSF MRSEC [DMR-1720139]
- State of Illinois
- Northwestern University
- NASA Ames Research Center [NNA06CB93G]
- National Science Foundation Graduate Research Fellowship
- Division Of Materials Research [1505849] Funding Source: National Science Foundation
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Germanium sulfide (GeS) is an emerging layered material with high promise in its two-dimensional (2D) exfoliated form for energy storage applications. While liquidphase 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.
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