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Confinement of ionic liquids aqueous mixtures between amorphous TiO2 slit nanopores: electrostatic field induction

Abstract

Electrostatic potential in the vicinity of the surface is induced when aqueous mixtures of hydrophobic and hydrophilic ionic liquids (ILs) are confined between a slit nanopore of amorphous but not crystalline TiO2 semiconductors. According to our molecular dynamics (MD) simulations, the extent of ion-pairing lifetime under such nanoscale confinement is substantially lower than its value in the bulk. It still becomes lower when aqueous mixtures of ionic liquid electrolytes are used. Ion-ion correlation is broken completely in the confined dilute aqueous electrolyte systems. Anions and cations of the ILs migrate and accumulate at opposite amorphous TiO2 electrodes that are separated by 10 nm to arrange a nanosize size pore. In contrast, we have shown that the electrostatic interaction between IL ions are dominant when the electrolyte is confined between anatase (101) TiO2. Similar trend is observed for inorganic electrolyte system. These findings shed lights on the design of new cells for electrochemical applications.

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Publication details

The article was received on 16 Jul 2018, accepted on 01 Nov 2018 and first published on 01 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP04500C
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Confinement of ionic liquids aqueous mixtures between amorphous TiO2 slit nanopores: electrostatic field induction

    F. Mohammadpour, M. Heydari Dokoohaki, A. R. R. Zolghadr, M. H. H. Ghatee and M. Moradi, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP04500C

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