3D Assembly of MXene Networks using a Ceramic Backbone with Controlled Porosity.

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Transition metal carbides (MXenes) are 2D nanomaterials with promising applications in energy storage and catalysis.
• A key challenge for MXenes is preventing restacking in 3D architectures, which degrades their performance.

Purpose of the Study:

• To develop a method for creating 3D MXene networks without restacking.
• To fabricate and characterize a novel 3D MXene material integrated into a porous ceramic backbone.

Main Methods:

• Fabrication of a porous silica backbone using freeze casting.
• Infiltration of MXene into the silica backbone via capillary flow.
• Characterization of the resulting 3D MXene-infiltrated porous silica (MX-PS) system's conductivity and structure.

Main Results:

• A reproducible method for creating interconnected 3D-MXene networks on a porous ceramic backbone.
• The MX-PS system exhibits high electrical conductivity (340 S m^-1).
• Sandwich-type supercapacitors using MX-PS electrodes achieved high areal capacitance (7.24 F cm^-2) and energy density (0.32 mWh cm^-2) with low MXene mass loading.

Conclusions:

• The developed approach successfully creates 3D MXene architectures, mitigating restacking issues.
• The 3D-MXene material demonstrates significant potential for high-performance energy storage devices.
• This fabrication strategy offers a pathway for advancing 2D nanomaterial applications in various engineering fields.