Liquid phase exfoliation of GeS nanosheets in ambient conditions for lithium ion battery applications
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Journal ArticleDate:
2020Access:
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Boland, J.B. and Tian, R. and Harvey, A. and Vega-Mayoral, V. and Griffin, A. and Horvath, D.V. and Gabbett, C. and Breshears, M. and Pepper, J. and Li, Y. and Coleman, J.N., Liquid phase exfoliation of GeS nanosheets in ambient conditions for lithium ion battery applications, 2D Materials, 7, 3, 2020Download Item:
Abstract:
The propensity of many 2D materials to oxidize in ambient conditions can complicate production and limit applications potential. Here we describe ambient liquid phase exfoliation of GeS, a layered material known for its chemical instability. Ambient exfoliation in organic solvents such as N-methyl-pyrrolidone yields good quality multi-layer GeS nanosheets. Although oxidation appears to occur with a time constant of ~10 d, the data suggests it to be limited to nanosheet edges leaving the basal plane intact. The rate of oxidation is slow enough to allow processing of the dispersions. For example, it was possible to size-select GeS nanosheets and characterize the size-dependence of nanosheet optical properties, leading to the observation of significant changes in bandgap with nanosheet thickness. Additionally, we were able to fabricate the nanosheets into lithium ion battery anodes using carbon nanotubes as both binder and conductive additive. These electrodes were relatively stable, showing ~0.2% capacity decay per cycle, and displayed low-rate capacity of 1523 mAh g−1 which is within 93% of the theoretical value. However, detailed analysis showed relatively poor rate performance, possibly due to nanosheet alignment.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
SFI/12/RC/2278
Science Foundation Ireland (SFI for RF)
SFI/11/PI/1087
European Union (EU)
604391
European Research Council (ERC)
Author's Homepage:
http://people.tcd.ie/colemajhttp://people.tcd.ie/jboland
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PUBLISHEDcited By 0
Author: Coleman, Jonathan; Boland, John
Sponsor:
Science Foundation Ireland (SFI)Science Foundation Ireland (SFI for RF)
European Union (EU)
European Research Council (ERC)
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Journal ArticleCollections
Series/Report no:
2D Materials7
3
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Full text availableDOI:
http://dx.doi.org/10.1088/2053-1583/ab89e6Metadata
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