Maximizing ion dynamics and electrochemical performance of ionic liquid-acetonitrile electrolyte in Ti3C2T x MXene

Naresh C. Osti; Xiaobo Lin; Wei Zhao; Xuehang Wang; Chaofan Chen; Yu Gao; Takeshi Torita; Alexander I. Kolesnikov; Peter T. Cummings; Yury Gogotsi; Eugene Mamontov

doi:10.1088/2053-1583/acacac

Maximizing ion dynamics and electrochemical performance of ionic liquid-acetonitrile electrolyte in Ti₃C₂T _x MXene

Naresh C. Osti, Xiaobo Lin, Wei Zhao, Xuehang Wang, Chaofan Chen, Yu Gao, Takeshi Torita, Alexander I. Kolesnikov, Peter T. Cummings, Yury Gogotsi, Eugene Mamontov

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Modification of the structure and morphology of MXene electrodes and the formulation of the electrolytes used in their supercapacitor configurations are significant factors affecting the performance of electrochemical devices. In this study, we investigated the electrochemical performance and ion dynamics of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [EmimTFSI], ionic liquid in the presence of acetonitrile (ACN) at different concentrations in Ti₃C₂T _x MXene supercapacitor. We found an optimum concentration of ACN, at which more cations from the ionic liquid attach to the MXene electrode surface, providing higher electrochemical performance. This higher capacitance is also associated with increased microscopic dynamics of the cation away from the pore wall. These findings give a guideline to optimize the performance of MXene-based supercapacitors using organic solvents-ionic liquid-based electrolyte systems.

Original language	English
Article number	014014
Journal	2D Materials
Volume	10
Issue number	1
DOIs	https://doi.org/10.1088/2053-1583/acacac
State	Published - Jan 2023

Funding

This work was supported as part of the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. Work at ORNL’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for U.S. DOE under Contract No. DEAC05-00OR22725. We would like to thank Dr Tyler S Mathis from the Drexel University for his contribution to developing the materials used in this work. This work was supported as part of the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. Work at ORNL’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for U.S. DOE under Contract No. DEAC05-00OR22725. We would like to thank Dr Tyler S Mathis from the Drexel University for his contribution to developing the materials used in this work.

Keywords

MXene
TiC
inelastic and quasielastic neutron scattering
supercapacitors

Access to Document

10.1088/2053-1583/acacac

Cite this

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abstract = "Modification of the structure and morphology of MXene electrodes and the formulation of the electrolytes used in their supercapacitor configurations are significant factors affecting the performance of electrochemical devices. In this study, we investigated the electrochemical performance and ion dynamics of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [EmimTFSI], ionic liquid in the presence of acetonitrile (ACN) at different concentrations in Ti3C2T x MXene supercapacitor. We found an optimum concentration of ACN, at which more cations from the ionic liquid attach to the MXene electrode surface, providing higher electrochemical performance. This higher capacitance is also associated with increased microscopic dynamics of the cation away from the pore wall. These findings give a guideline to optimize the performance of MXene-based supercapacitors using organic solvents-ionic liquid-based electrolyte systems.",

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AU - Chen, Chaofan

AU - Gao, Yu

AU - Torita, Takeshi

AU - Kolesnikov, Alexander I.

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AU - Mamontov, Eugene

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