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Updated: Feb 27, 2026
07:45
Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
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Superprotonic Mixed Matrix Membranes Based on Anionic MOFs Containing Dimethylammonium Cations for Sustainable Energy
Swati Bedi1, Bholanath Ghanti2, Susanta Banerjee2
1Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
Inorganic Chemistry
|February 25, 2026
Summary
Two new cadmium-based metal-organic frameworks (MOFs) were synthesized for proton exchange membrane fuel cells (PEMFCs). One MOF, Cd-FAIA-2, demonstrated superior proton conductivity, especially when incorporated into a polymer matrix for enhanced fuel cell performance.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Proton exchange membrane fuel cells (PEMFCs) require materials with high proton conductivity and structural stability for sustainable energy.
- Metal-organic frameworks (MOFs) are promising candidates due to their tunable structures and potential for proton transport.
Purpose of the Study:
- To develop novel cadmium-based MOFs using a pH-controlled synthesis for improved proton conductivity.
- To investigate the proton transport mechanisms within these MOFs and their potential for fuel cell applications.
Main Methods:
- A pH-controlled synthetic strategy was employed to create two cadmium-based MOFs: Cd-FAIA-1 (neutral) and Cd-FAIA-2 (anionic).
- Structural characterization was performed to understand the framework compositions and guest molecule inclusion.
- Proton conductivity measurements were conducted under varying humidity and temperature conditions.
- Cd-FAIA-2 was incorporated into a polyvinylpyrrolidone-polyvinylidene fluoride (PVP-PVDF) matrix to form mixed matrix membranes (MMMs).
Main Results:
- Cd-FAIA-1 exhibited a layered structure, while Cd-FAIA-2 formed a porous network hosting water and dimethylammonium cations, facilitating solvent-assisted proton conduction.
- Cd-FAIA-2 showed significantly higher proton conductivity (8.76 × 10-3 S·cm-1 at 80 °C and 98% RH) compared to Cd-FAIA-1 (3.64 × 10-4 S·cm-1).
- The mixed matrix membrane Cd-FAIA-2@MMM-60 achieved a superprotonic conductivity of 3.21 × 10-2 S·cm-1, exceeding the pristine MOF performance.
- Gram-scale synthesis of the MOFs was demonstrated, indicating scalability for industrial applications.
Conclusions:
- The synthesized MOFs, particularly Cd-FAIA-2, show excellent potential for proton conduction in PEMFCs.
- The incorporation of Cd-FAIA-2 into polymer matrices significantly enhances proton conductivity through cooperative effects.
- These findings pave the way for developing advanced materials for efficient and sustainable electrochemical energy devices.
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