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Enhancing Directional Ion Transport and Ionic Gradient Power by Engineering a Subnano-on-Meso Architecture Based on
Guang Hui Teoh1, Wen-Hsin Hung1, Ya-Chun Li1
1Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.
Small (Weinheim an Der Bergstrasse, Germany)
|June 11, 2026
Summary
Researchers developed a novel mesoscale ionic diode using porous MXene material. This breakthrough enables efficient ion transport and osmotic power generation, even in high salinity conditions, overcoming previous limitations.
Area of Science:
- Nanotechnology
- Materials Science
- Electrochemistry
Background:
- Ion-selective membranes are crucial for directional ion transport and osmotic power conversion.
- Conventional nanofluidic systems suffer from poor rectification in high ionic strengths due to Debye length screening, limiting practical applications.
Purpose of the Study:
- To develop a high-performance mesoscale ionic diode capable of efficient ion transport and osmotic power conversion under realistic salinity conditions.
- To overcome the limitations of Debye length screening in conventional nanofluidic systems.
Main Methods:
- Fabrication of a single conical mesochannel modified with a porous MXene layer (p-MXene@MC).
- Characterization of the p-MXene@MC architecture for ion transport and rectification properties.
- Utilizing Poisson-Nernst-Planck and Navier-Stokes models for simulation and validation.
Main Results:
- The p-MXene@MC exhibited strong ion rectification (7.7-fold at 1 M KCl) even at high ionic strengths.
- Achieved a maximum osmotic power of 697 pW under a 1000-fold KCl gradient, surpassing previous single-channel devices.
- Proton transport through the MXene framework further enhanced power output to approximately 1001 pW.
Conclusions:
- The porous MXene modification provides a generalizable strategy to overcome electrostatic screening and transport limitations in mesoscale channels.
- This advancement paves the way for practical nanofluidic energy harvesting technologies.
- The developed ionic diode demonstrates significant potential for efficient energy conversion in diverse salinity environments.
