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Synthesis and Characterization of 2D Molybdenum Carbide (MXene)
Author(s) -
Halim Joseph,
Kota Sankalp,
Lukatskaya Maria R.,
Naguib Michael,
Zhao MengQiang,
Moon Eun Ju,
Pitock Jeremy,
Nanda Jagjit,
May Steven J.,
Gogotsi Yury,
Barsoum Michel W.
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201505328
Subject(s) - materials science , molybdenum , electrolyte , carbide , annealing (glass) , transition metal , electrode , chemical engineering , nanotechnology , composite material , metallurgy , catalysis , biochemistry , chemistry , engineering
Large scale synthesis and delamination of 2D Mo 2 CT x (where T is a surface termination group) has been achieved by selectively etching gallium from the recently discovered nanolaminated, ternary transition metal carbide Mo 2 Ga 2 C. Different synthesis and delamination routes result in different flake morphologies. The resistivity of free‐standing Mo 2 CT 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 Ti 3 C 2 T 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 Mo 2 CT 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.