Synthesis and Characterization of 2D Molybdenum Carbide (MXene)

Joseph Halim, Sankalp Kota, Maria R. Lukatskaya, Michael Naguib, Meng Qiang Zhao, Eun Ju Moon, Jeremy Pitock, Jagjit Nanda, Steven J. May, Yury Gogotsi, Michel W. Barsoum

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992 Scopus citations

Abstract

Large scale synthesis and delamination of 2D Mo2CT x (where T is a surface termination group) has been achieved by selectively etching gallium from the recently discovered nanolaminated, ternary transition metal carbide Mo2Ga2C. Different synthesis and delamination routes result in different flake morphologies. The resistivity of free-standing Mo2CT x films increases by an order of magnitude as the temperature is reduced from 300 to 10 K, suggesting semiconductor-like behavior of this MXene, in contrast to Ti3C2T x which exhibits metallic behavior. At 10 K, the magnetoresistance is positive. Additionally, changes in electronic transport are observed upon annealing of the films. When 2 μm thick films are tested as electrodes in supercapacitors, capacitances as high as 700 F cm-3 in a 1 m sulfuric acid electrolyte and high capacity retention for at least 10,000 cycles at 10 A g-1 are obtained. Free-standing Mo2CT x films, with ≈8 wt% carbon nanotubes, perform well when tested as an electrode material for Li-ions, especially at high rates. At 20 and 131 C cycling rates, stable reversible capacities of 250 and 76 mAh g-1, respectively, are achieved for over 1000 cycles.

Original languageEnglish (US)
Pages (from-to)3118-3127
Number of pages10
JournalAdvanced Functional Materials
Volume26
Issue number18
DOIs
StatePublished - May 10 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials

Keywords

  • 2D material
  • electronic properties
  • energy storage
  • transition metal carbide

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