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Measuring Proton Conductivity in MOF-Based Mixed Matrix Membranes by Electrochemical Impedance Spectroscopy
Ermias Mideksa1, Edgar Anies1, Vanessa Pimenta2
1Institut des Matériaux Poreux de Paris, ESPCI Paris, École Normale Supérieure, CNRS, PSL University.
Abstract:
This protocol describes a reproducible method to measure the in-plane proton conductivity of metal-organic framework (MOF)/polymer mixed-matrix membranes (MMMs) through electrochemical impedance spectroscopy (EIS) under controlled temperature and humidity conditions. The MMMs were fabricated by solution casting method using the non-fluorinated, water-processable polymer, poly (vinyl alcohol) (PVA) and the proton-conducting MOF MIP-207-SO3H. The synthesis of MIP-207-SO3H is detailed, followed by membrane fabrication, assembly of in-plane conductivity measurement cells, and acquisition of membrane resistance through EIS. This enables accurate acquisition and determination of membrane resistance, determination of proton conductivity, and activation energy. The representative results demonstrate that MIP-207-SO3H-containing membranes exhibit enhanced proton conductivity under the test conditions compared to the membrane without MOF incorporation.
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