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Stable MXene Dough with Ultrahigh Solid Fraction and Excellent Redispersibility toward Efficient Solution Processing

Shungui Deng1,2,3, Tiezhu Guo2,4, Frank Nüesch2,3

  • 1College of Materials Science & Engineering, Sichuan University, Chengdu, 610065, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 20, 2023
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Summary

Researchers developed a novel "MXene dough" using a bottom-up approach for 3D printing. This highly concentrated material offers excellent conductivity and stability, paving the way for advanced electronic devices.

Keywords:
doughextrusion printinginksmicro-supercapacitorstransition metal carbidestwo-dimensional MXene

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Two-dimensional (2D) transition metal carbides/nitrides (MXenes) are crucial for energy storage and electronics.
  • Printing functional devices requires MXene inks with specific rheological properties.
  • Traditional methods for high-solid-fraction MXene inks involve water removal (top-down).

Purpose of the Study:

  • To develop a bottom-up method for creating highly concentrated MXene-water blends.
  • To investigate the properties and processability of this new MXene material.
  • To demonstrate its application in fabricating micro-supercapacitors.

Main Methods:

  • Controlled water admixture to freeze-dried MXene flakes using water mist.
  • Characterization of MXene dough properties (electrical conductivity, stability, ductility).
  • Fabrication of a micro-supercapacitor using the MXene dough.

Main Results:

  • A critical MXene solid content threshold (≈60%) for dough formation was identified.
  • The MXene dough exhibits high electrical conductivity and excellent oxidation stability.
  • A micro-supercapacitor was successfully fabricated with a gravimetric capacitance of 161.7 F g-1.

Conclusions:

  • The bottom-up approach yields a stable and conductive MXene dough.
  • This MXene dough demonstrates significant potential for additive manufacturing and commercialization.
  • The material shows promise for advanced electrochemical energy storage devices.