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Title
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Hydration effects and negative dielectric constant of nano-confined water between cation intercalated MXenes
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Author
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Abstract
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| Using electrochemical methods a profound enhancement of the capacitance of electric double layer capacitor electrodes was reported when water molecules are strongly confined into the two-dimensional slits of titanium carbide MXene nanosheets [A. Sugahara et al., Nat. Commun., 2019, 10, 850]. We study the effects of hydration on the dielectric properties of nanoconfined water and supercapacitance properties of the cation intercalated MXene. A model for the electric double layer capacitor is constructed where water molecules are strongly confined in two-dimensional slits of MXene. We report an abnormal dielectric constant and polarization of nano-confined water between MXene layers. We found that by decreasing the ionic radius of the intercalated cations and in a critical hydration shell radius the capacitance of the system increases significantly (similar or equal to 200 F g(-1)) which can be interpreted as a negative permittivity. This study builds a bridge between the fundamental understanding of the dielectric properties of nanoconfined water and the capability of using MXene films for supercapacitor technology, and in doing so provides a solid theoretical support for recent experiments. |
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Language
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English
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Source (journal)
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Nanoscale / Royal Society of Chemistry [London] - Cambridge, 2009, currens
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Publication
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Cambridge
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2021
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ISSN
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2040-3364
[print]
2040-3372
[online]
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DOI
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10.1039/D0NR03953E
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Volume/pages
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13
:2
(2021)
, p. 922-929
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ISI
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000610368100035
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Pubmed ID
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33367377
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Full text (Publisher's DOI)
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