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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Cation-π and Electrostatic Interplay in Ultraselective Polymeric Nanofluidics for Exceptional Osmotic Energy
Dehua Huang1,2, Wen-Xiong Shi3, Zidi Yan1,2
1Laboratory of Bio-inspired Smart Interface Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Journal of the American Chemical Society
|June 15, 2026
Summary
Researchers developed novel polymeric nanofluidics using cation-π interactions to overcome concentration polarization, achieving high ion selectivity and efficiency for osmotic energy generation.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Fast ion transport in nanofluidics is crucial for osmotic energy generators.
- Concentration polarization (CP) limits ion selectivity and energy conversion efficiency in traditional nanofluidics.
Purpose of the Study:
- To design ultraselective polymeric nanofluidics with enhanced immunity to CP.
- To investigate the interplay of cation-π interactions and electrostatics for improved ion transport.
Main Methods:
- Utilized polyanions with carbazole and sulfonic moieties for nanofluidic design.
- Conducted experimental measurements and simulations to analyze ion transport mechanisms.
- Investigated the "adsorption-to-transport" mechanism driven by cation-π forces.
Main Results:
- Observed an anomalous CP effect, contrary to typical ion dissipation-dominated decline.
- Demonstrated increased interphase salinity gradients, enhancing cation/anion transmembrane selectivity.
- Achieved a record single-cell voltage output and ultrahigh energy conversion efficiency in osmotic power generators over 72 days.
Conclusions:
- Supramolecular effects, specifically cation-π interactions, play a vital role in designing ultraselective nanofluidic systems.
- The developed nanofluidics show significant potential for efficient and stable osmotic energy generation.
- This approach offers new insights into overcoming CP limitations in nanofluidic devices.
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