Fast assembly of MXene hydrogels by interfacial electrostatic interaction for supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• MXene materials are promising for energy storage due to their unique properties.
• Restacking and oxidation of MXenes limit their performance in applications like supercapacitors.
• Developing stable and efficient MXene-based electrode materials is crucial for advanced energy storage.

Purpose of the Study:

• To develop a simple and fast method for preparing MXene hydrogels.
• To improve the electrochemical performance and stability of MXene-based supercapacitor electrodes.
• To investigate the role of protonated thionine molecules in MXene hydrogel formation and properties.

Main Methods:

• Introducing protonated thionine molecules into a MXene dispersion via electrostatic interaction.
• Fabricating a 3D MXene hydrogel structure.
• Characterizing the hydrogel's structure and properties.
• Evaluating the performance of the hydrogel as an electrode material for supercapacitors.

Main Results:

• A simple and fast method for preparing MXene hydrogels was successfully developed.
• The 3D hydrogel structure effectively suppressed MXene restacking and oxidation.
• The prepared MXene hydrogel exhibited an improved specific capacitance of 163 F g⁻¹ at 1 A g⁻¹.
• The material demonstrated excellent stability when used as a supercapacitor electrode.

Conclusions:

• Protonated thionine molecules can be effectively used to prepare MXene hydrogels.
• The developed MXene hydrogel is a promising electrode material for high-performance supercapacitors.
• This method offers a facile route to enhance the utilization and stability of MXene materials for energy storage.