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Proton Conduction in a Phosphonate-Based Metal-Organic Framework Mediated by Intrinsic "Free Diffusion inside a
Simona Pili1, Stephen P Argent2, Christopher G Morris2,3
1School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, U.K.
Journal of the American Chemical Society
|May 17, 2016
Summary
Proton conductivity in MFM-500(Ni) metal-organic frameworks (MOFs) is driven by free diffusion. Quasi-elastic neutron scattering reveals this unique proton transport mechanism in MOFs.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Proton conduction mechanisms in materials are vital for developing advanced conductivity solutions.
- Metal-organic frameworks (MOFs) offer tunable structures for potential proton transport applications.
Purpose of the Study:
- To elucidate the molecular mechanism of proton diffusion in a novel phosphonate-based MOF, MFM-500(Ni).
- To investigate the proton conductivity of MFM-500(Ni) under high humidity conditions.
Main Methods:
- Quasi-elastic neutron scattering (QENS) was employed to study proton dynamics.
- Proton conductivity measurements were performed at 98% relative humidity and 25 °C.
Main Results:
- QENS data indicated that proton diffusion in MFM-500(Ni) occurs via intrinsic "free diffusion inside a sphere".
- MFM-500(Ni) exhibited a proton conductivity of 4.5 × 10⁻⁴ S/cm.
Conclusions:
- The study identifies a novel proton diffusion mechanism in MOFs.
- MFM-500(Ni) demonstrates significant proton conductivity mediated by this unique mechanism, highlighting its potential for proton-conducting materials.
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