Flexible and conductive MXene films and nanocomposites with high capacitance

Zheng Ling, Chang E. Ren, Meng Qiang Zhao, Jian Yang, James M. Giammarco, Jieshan Qiu, Michel W. Barsoum, Yury Gogotsi

Research output: Contribution to journalArticlepeer-review

1753 Scopus citations

Abstract

MXenes, a new family of 2D materials, combine hydrophilic surfaces with metallic conductivity. Delamination of MXene produces single-layer nanosheets with thickness of about a nanometer and lateral size of the order of micrometers. The high aspect ratio of delaminated MXene renders it promising nanofiller in multifunctional polymer nanocomposites. Herein, Ti3C2Tx MXene was mixed with either a charged polydiallyldimethylammonium chloride (PDDA) or an electrically neutral polyvinyl alcohol (PVA) to produce Ti3C2Tx/ polymer composites. The as-fabricated composites are flexible and have electrical conductivities as high as 2.2 × 104 S/m in the case of the Ti3C2Tx/PVA composite film and 2.4 × 105 S/m for pure Ti3C2Tx films. The tensile strength of the Ti3C2Tx/PVA composites was significantly enhanced compared with pure Ti3C2Tx or PVA films. The intercalation and confinement of the polymer between the MXene flakes not only increased flexibility but also enhanced cationic intercalation, offering an impressive volumetric capacitance of ~530 F/cm3 for MXene/PVA-KOH composite film at 2 mV/s. To our knowledge, this study is a first, but crucial, step in exploring the potential of using MXenes in polymer-based multifunctional nanocomposites for a host of applications, such as structural components, energy storage devices, wearable electronics, electrochemical actuators, and radiofrequency shielding, to name a few.

Original languageEnglish (US)
Pages (from-to)16676-16681
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume111
Issue number47
DOIs
StatePublished - Nov 25 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • 2D material
  • Composite
  • Film
  • MXene
  • Supercapacitor

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