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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
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.
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.
