Bioinspired Ti₃ C₂ T_x MXene-Based Ionic Diode Membrane for High-Efficient Osmotic Energy Conversion.

Area of Science:

• Materials Science
• Nanotechnology
• Sustainable Energy

Background:

• Developing efficient ion channels for energy conversion is crucial.
• Asymmetric nanofluidic channels with ionic diode behavior can enhance blue energy.
• Two-dimensional (2D) MXenes offer tunable properties for creating such channels.

Purpose of the Study:

• To engineer a mechanically robust and flexible asymmetric nanofluidic ion channel using MXenes.
• To demonstrate the ionic diode behavior and high current rectification of the MXene membrane.
• To evaluate the performance of the MXene-based membrane in reverse electrodialysis for osmotic energy conversion.

Main Methods:

• Fabrication of an asymmetric Ti3C2Tx MXene-based membrane.
• Characterization of the membrane's ionic diode behavior and current rectification.
• Testing the membrane's power density in a reverse electrodialysis setup with varying salinity gradients.

Main Results:

• The Ti3C2Tx MXene membrane exhibited robust, flexible, and scale-up-friendly properties.
• The membrane demonstrated highly rectified current, indicative of ionic diode behavior.
• Power densities of 8.6 W/m² and up to 17.8 W/m² were achieved under significant salinity gradients.

Conclusions:

• The developed MXene-based ionic diode membrane is a promising material for efficient blue energy harvesting.
• This approach offers a facile and general strategy for large-scale 2D nanofluidics and selective ion transport.
• The findings pave the way for advanced materials in sustainable osmotic power generation.