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Updated: Oct 28, 2025

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Sandwich "Ion Pool"-Structured Power Gating for Salinity Gradient Generation Devices.

Lulu Fu¹, Yuting Wang¹, Jiaqiao Jiang¹

¹Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Chemistry, Beihang University, Beijing 100191, P. R. China.

ACS Applied Materials & Interfaces

|July 16, 2021

Summary

This summary is machine-generated.

Researchers developed an "ion pool" nanofluidic diode using ZIF-8, AAO, and WO3 membranes. This structure enhances ion confinement, achieving a high rectification ratio of 192 for improved energy conversion applications.

Keywords:

confinement effect ion pool pH responsive power gating salinity gradient power generation

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Published on: March 1, 2020

Area of Science:

Nanotechnology
Materials Science
Electrochemistry

Background:

Nanoconfinement ion transport mimics biological ion channels, crucial for energy conversion and nanofluidic diodes.
Current nanofluidic diodes improve rectification via geometrical, chemical, and electrostatic asymmetries, often neglecting confinement effects.
Confinement effects are critical for ion rectification behavior, yet their role in device performance remains underexplored.

Purpose of the Study:

To investigate the impact of confinement effects on nanofluidic diode performance.
To design and fabricate an "ion pool" structured nanofluidic diode to enhance confinement.
To achieve high ion rectification ratios and pH-responsive gating for energy harvesting.

Main Methods:

Fabrication of a nanofluidic diode using anodic aluminum oxide (AAO) sandwiched between zeolitic imidazolate framework 8 (ZIF-8) and tungsten oxide (WO3) thin membranes.
Creation of an "ion pool" structure within the AAO membrane to modulate ion confinement.
Characterization of ion transport, rectification ratio, ion selectivity, and pH-responsive gating behavior.

Main Results:

Achieved a high rectification ratio of 192 due to effective ion enrichment/depletion within the ion pool.
Demonstrated pH-responsive and excellent ion selectivity in the developed nanofluidic diode.
Developed a pH-responsive power gating device for salinity gradient energy harvesting with a gating ratio of 27, an 8-fold increase over control membranes.

Conclusions:

The "ion pool" structure significantly enhances ion confinement, leading to high rectification ratios in nanofluidic diodes.
The developed device exhibits promising pH-responsive gating capabilities for salinity gradient energy harvesting.
This work offers new strategies for designing and optimizing nanofluidic diodes for advanced energy conversion applications.