Ultrathin Magnesium-Ion Selective COF Membranes for Efficient Osmotic Power and Iontronic Logic Control

doi:10.1002/smll.74164

Ultrathin Magnesium-Ion Selective COF Membranes for Efficient Osmotic Power and Iontronic Logic Control

2026-06-07

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王振林 (Zhong Lin Wang) *

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Di Wei *

DOI：10.1002/smll.74164

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Magnesium ions (Mg2+), vital for biological signaling and energy regulation, remain challenging to selectively and efficiently transport using artificial membranes, which typically lack molecular recognition and confined ion channels. Here, we report a β-ketoenamine covalent organic framework (TAPA-TFP COF) membrane that achieves near-ideal Mg2+ selectivity (t+ = 0.98) and ultrafast transport through ordered 13.6 Å nanochannels. Structural and molecular dynamics analyses reveal that the precisely arranged O/N coordination sites within the porous nanochannels partially strip the Mg2+ hydration shell, while C = O···H─O─H hydrogen-bond networks lower migration barriers, enabling high permeability. The ultrathin, large-area, and defect-free membrane delivers record osmotic power and current densities of 636.64 W m−2 and 9213.3 A m−2 under a 500-fold salinity gradient. Beyond efficient power generation, the Mg2+-selective nanochannels enable iontronic transistors, logic operations, and multimodal signal transduction, establishing a molecularly engineered porous platform that integrates ion-specific transport with energy conversion and information processing.

Keywords:

covalent organic framework (COF) membranes

iontronic logic control

Mg2+ selective transport

osmotic power conversion

Ultrathin Magnesium-Ion Selective COF Membranes for Efficient Osmotic Power and Iontronic Logic Control

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