TY - JOUR
T1 - Anhydrous Liquid-Phase Exfoliation of Pristine Electrochemically Active GeS Nanosheets
AU - Lam, David
AU - Chen, Kan Sheng
AU - Kang, Joohoon
AU - Liu, Xiaolong
AU - Hersam, Mark C.
N1 - Funding Information:
Solution processing and structural/chemical characterization were supported by the National Science Foundation (DMR-1505849), and battery fabrication and testing were supported by the Center for Electrochemical Energy Science, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences (DE-AC02-06CH11357). This work made use of the NUANCE Center, which has received support from the NSF MRSEC (DMR-1720139), the State of Illinois, and Northwestern University. Metal analysis was performed at the Northwestern University Quantitative Bio-Element Imaging Center, which is supported by NASA Ames Research Center NNA06CB93G. D.L. is also supported by a National Science Foundation Graduate Research Fellowship. The authors further acknowledge Dr. Junmo Kang, Dr. Josh D. Wood, Dr. Ethan B. Secor, and Norman S. Luu for helpful discussions.
Funding Information:
were supported by the National Science Foundation (DMR-1505849), and battery fabrication and testing were supported by the Center for Electrochemical Energy Science, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences (DE-AC02-06CH11357). This work made use of the NUANCE Center, which has received support from the NSF MRSEC (DMR-1720139), the State of Illinois, and Northwestern University. Metal analysis was performed at the Northwestern University Quantitative Bio-Element Imaging Center, which is supported by NASA Ames Research Center NNA06CB93G. D.L. is also supported by a National Science Foundation Graduate Research Fellowship.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/4/10
Y1 - 2018/4/10
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.chemmater.7b04652
DO - 10.1021/acs.chemmater.7b04652
M3 - Article
AN - SCOPUS:85045200753
SN - 0897-4756
VL - 30
SP - 2245
EP - 2250
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 7
ER -
