Negative dielectric constant of water confined in nanosheets

Nature Communications
Akira SugaharaAtsuo Yamada

Abstract

Electric double-layer capacitors are efficient energy storage devices that have the potential to account for uneven power demand in sustainable energy systems. Earlier attempts to improve an unsatisfactory capacitance of electric double-layer capacitors have focused on meso- or nanostructuring to increase the accessible surface area and minimize the distance between the adsorbed ions and the electrode. However, the dielectric constant of the electrolyte solvent embedded between adsorbed ions and the electrode surface, which also governs the capacitance, has not been previously exploited to manipulate the capacitance. Here we show that the capacitance of electric double-layer capacitor electrodes can be enlarged when the water molecules are strongly confined into the two-dimensional slits of titanium carbide MXene nanosheets. Using electrochemical methods and theoretical modeling, we find that dipolar polarization of strongly confined water resonantly overscreens an external electric field and enhances capacitance with a characteristically negative dielectric constant of a water molecule.

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Citations

Jun 25, 2019·Chemical Communications : Chem Comm·Kijae KimAtsuo Yamada
Apr 3, 2020·Chemical Society Reviews·Eric BreynaertJohan A Martens
May 13, 2020·Physical Chemistry Chemical Physics : PCCP·Sergi Ruiz-BarraganDominik Marx
Aug 12, 2020·Chemical Society Reviews·Minmin HuZhenjiang Li
Oct 28, 2019·Nature Communications·Cheng ZhanPatrick G Campbell
Feb 6, 2020·Chemical Science·Nicolas Dubouis, Alexis Grimaud
Sep 19, 2020·Physical Review. E·H JalaliF M Peeters
Feb 4, 2021·The Journal of Physical Chemistry. B·Hossein JalaliMehdi Neek-Amal
Jan 31, 2021·The Journal of Chemical Physics·Sayantan Mondal, Biman Bagchi
May 20, 2021·Chemical Reviews·Daniel Muñoz-Santiburcio, Dominik Marx
Jun 11, 2021·The Journal of Physical Chemistry. B·Jeet MajumdarPrabal K Maiti
Jul 1, 2020·Chemical Reviews·Simon FleischmannVeronica Augustyn
Oct 24, 2020·Journal of the American Chemical Society·Kent J GriffithClare P Grey
Dec 1, 2020·Nano Letters·Sayantan Mondal, Biman Bagchi
Sep 24, 2020·ACS Nano·Mohammad H Motevaselian, Narayana R Aluru
Dec 21, 2021·Chemical Reviews·Stefan RingeKarsten Reuter

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Methods Mentioned

BETA
X-ray
NMR

Software Mentioned

Quantum Espresso
Rigaku REX2000

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