Heteroatom-embedded Mellitic Triimido COFs for efficient proton conduction
Keiichiro Maegawa1,2,3, Mateusz Wlazło4, Vellaichamy Joseph1
1Next-Generation Energy Systems group, Centre of Excellence ENSEMBLE3 sp. z o.o, Wólczyńska 133, Warsaw, 01-919, Poland.
Scientific Reports
|February 17, 2025
Summary
Researchers synthesized a novel ionic covalent organic framework (iCOF) for anhydrous proton conduction. This new material demonstrates high proton conductivity, paving the way for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Ionic covalent organic frameworks (iCOFs) show promise for energy storage due to inherent ion transport capabilities and ordered pore structures.
- Efficient ion transport in frameworks is crucial for long-term stability under demanding electrochemical conditions.
Purpose of the Study:
- To synthesize a novel iCOF with heteroatom-embedded mellitic triimido COF framework for anhydrous proton conduction.
- To investigate the role of the 2,5-diaminopyridine (DAPy) linker in facilitating proton transport.
- To evaluate the proton conductivity of the synthesized iCOF under anhydrous conditions.
Main Methods:
- Synthesis of a novel iCOF using a heteroatom-embedded mellitic triimido COF framework with 2,5-diaminopyridine (DAPy) linkers.
- Impregnation of H3PO4 into the iCOF structure.
- Evaluation of anhydrous proton conductivity at elevated temperatures.
Main Results:
- Successful synthesis of an unprecedented iCOF with Angstrom-scale ion channels.
- The heterocyclic pyridine group in DAPy acted as a proton acceptor, enhancing interaction with H3PO4.
- The resulting PA@MTI-DAPy-COF achieved a high proton conductivity of 3.68 × 10^-2 S cm^-1 at 150°C under anhydrous conditions.
Conclusions:
- The developed iCOF exhibits excellent anhydrous proton conductivity, suitable for energy storage applications.
- Leveraging the stacking structure of COF skeletons is an effective strategy for creating efficient proton-conducting channels.
- This research opens new avenues for designing advanced proton conductors for electrochemical devices.
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