Near-frictionless ion transport within triazine framework membranes
Peipei Zuo1, Chunchun Ye2, Zhongren Jiao1
1Key Laboratory of Precision and Intelligent Chemistry, Department of Applied Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, P. R. China.
Nature
|April 26, 2023
Summary
Researchers developed advanced synthetic membranes with confined ion channels for efficient electrochemical devices. These low-resistance, high-selectivity membranes approach ion diffusion limits, enhancing energy storage and separation processes.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Advancements in electrochemical technologies like water electrolyzers, fuel cells, and redox flow batteries rely on efficient ion-transport membranes.
- Current challenges include designing membranes that are low-resistance, highly selective, scalable, and cost-effective.
- Ion transport is governed by pore architecture and pore-analyte interactions, influencing energy barriers.
Purpose of the Study:
- To develop novel synthetic membranes that enable near-frictionless ion transport for improved electrochemical device performance.
- To overcome the limitations of existing membranes in terms of energy barriers and selectivity.
- To demonstrate the broad applicability of the membrane design in energy storage and separation.
Main Methods:
- Fabrication of large-area, free-standing synthetic membranes using covalently bonded polymer frameworks.
- Engineering rigidity-confined ion channels within the polymer framework to facilitate low-energy-barrier transport.
- Characterization of ion diffusion coefficients and area-specific membrane resistance.
Main Results:
- Achieved a Na+ diffusion coefficient of 1.18 × 10^-9 m2s-1, approaching the diffusion limit in pure water.
- Demonstrated a low area-specific membrane resistance of 0.17 Ωcm2.
- Successfully implemented membranes in aqueous organic redox flow batteries, showing high energy efficiency and capacity utilization at high current densities (up to 500 mAcm-2).
- Prevented capacity decay caused by ion crossover.
Conclusions:
- The developed membrane design, featuring robust micropore confinement and multi-ion interactions, significantly enhances ion transport efficiency.
- These membranes offer a promising solution for next-generation electrochemical devices and precise molecular separations.
- The strategy provides a pathway for designing efficient, scalable, and low-cost selective ion-transport membranes.
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