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Summary
This summary is machine-generated.

We developed a Layer-by-Layer (LbL) self-assembly method using tris(2-aminoethyl) amine (TAEA) and Ti3C2Tx MXene to create highly conductive pillared multilayers for supercapacitors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Two-dimensional (2D) materials like MXene offer unique properties but often face challenges in ordered assembly and conductivity.
  • Layer-by-Layer (LbL) self-assembly is a versatile technique for fabricating multilayered structures.
  • Enhancing the conductivity and structural integrity of MXene-based materials is crucial for energy storage applications.

Purpose of the Study:

  • To develop a novel LbL self-assembly method for creating pillared 2D MXene multilayers.
  • To investigate the structural and electronic properties of MXene/TAEA multilayers.
  • To evaluate the performance of these multilayers as electrodes in flexible supercapacitors.

Main Methods:

  • Utilized Layer-by-Layer (LbL) self-assembly in aqueous solution.
  • Employed tris(2-aminoethyl) amine (TAEA) as a pillaring agent with Ti3C2Tx MXene dispersions.
  • Fabricated (MXene/TAEA)n multilayers with controlled bilayer stacking.

Main Results:

  • Achieved highly ordered (MXene/TAEA)n multilayers with minimal expansion of MXene interlayer spacing (~1 Å).
  • Obtained exceptional electronic conductivity of 7.3 × 10^4 S/m, the highest reported for LbL-fabricated MXene multilayers.
  • Demonstrated high volumetric capacitance (583 F/cm³) and energy/power densities (3.0 Wh/L and 4400 W/L) in flexible supercapacitors.

Conclusions:

  • The TAEA-pillared MXene multilayers exhibit superior electronic conductivity and electrochemical performance.
  • This LbL strategy enables scalable fabrication of advanced 2D heterostructures for energy storage.
  • The method holds potential for creating other functional 2D material-based devices.