<i>d</i>-Spacing Effect on the Electrochemical Performance of MXene in Room Temperature Ionic Liquid Electrolyte

ORAL

Abstract

MXenes exhibit excellent capacitance at high rates in aqueous electrolytes specially in H2SO4 aqueous electrolyte, but in a narrow potential window, which limits the energy density. Moreover, oxidation of Ti3C2 under high anodic potentials in aqueous electrolytes further limits its use to cathodes of asymmetric devices. Organic electrolyte and room temperature ionic liquids (RTIL) provide larger potential window, leading higher energy density. In this work, different intercalants were introduced in-between Ti3C2Tz, producing different interlayer spacing (d-spacing). RTIL were employed as electrolytes to investigate the d-spacing effects on electrochemical performance for three-electrode system. As a result, intercalated Ti3C2Tz, provides much broader operating window of 3.2 V, showing much higher specific capacitances of 257 F/g, energy and power densities of 256 Wh/kg and 46000 W/kg, respectively, and cycling stability than pristine Ti3C2Tz. In addition, the electrochemical performance, ions dynamics were investigated by ex situ X-ray diffraction (XRD), broadband dielectric spectroscopy (BDS) and quasi elastic neutron scattering (QENS) spectra.

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Presenters

  • Michael Naguib

    • Tulane Univ

Authors

  • KUN LIANG

    • Tulane Univ

  • Ray Matsumoto

    • Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, USA
    • Vanderbilt University

  • Wei Zhao

    • Vanderbilt University

  • Naresh Osti

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

  • Madhusudan Tyagi

    • National Institute of Standards and Technology
    • NIST Center for Neutron Research, 444 National Institute of Standards and Technology, Gaithersburg, 445 Maryland 20899, United States
    • National Institute of Science and Technology
    • NIST Center for Neutron Research | NIST
    • NIST

  • Eugene Mamontov

    • Oak Ridge National Lab
    • Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

  • Ivan Popov

    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory

  • Alexei Sokolov

    • Oak Ridge National Lab
    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory
    • University of Tennessee
    • Department of Chemistry, University of Tennessee, Knoxville, USA
    • Department of Chemistry, university of Tennessee

  • Bishnu Thapaliya

    • Oak Ridge National Laboratory

  • Simon Fleischmann

    • North Carolina State University

  • Kaitlyn Prenger

    • Tulane Univ

  • Veronica Augustyn

    • North Carolina State University

  • Sheng Dai

    • Oak Ridge National Laboratory

  • Peter Thomas Cummings

    • Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, USA
    • Vanderbilt University

  • Michael Naguib

    • Tulane Univ