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001046699 005__ 20251006201535.0
001046699 037__ $$aFZJ-2025-03918
001046699 1001_ $$0P:(DE-Juel1)165598$$aSchatz, Michael$$b0$$eCorresponding author
001046699 1112_ $$aEFCF 2025: Low-Temp. Fuel Cells, Electrolysers & H2 Processing$$cLucerne$$d2025-07-01 - 2025-07-04$$wSwitzerland
001046699 245__ $$aA PEM Electrolysis Cell for In Operando NMR and MRI Investigations of MEA Degradation
001046699 260__ $$c2025
001046699 300__ $$a1-9
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001046699 3367_ $$0PUB:(DE-HGF)8$$2PUB:(DE-HGF)$$aContribution to a conference proceedings$$bcontrib$$mcontrib$$s1759746678_24668
001046699 520__ $$aProton exchange membrane (PEM) electrolysis is a promising process for sustainable hydrogen production, but its commercialization is delayed by high costs and elusive degradation of membrane electrode assemblies (MEAs) [1]. In operando Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI) offer the potential to investigate degradation mechanisms during electrolysis, and thus, provide highly relevant insights for enhanced performance [2,3].In a first part of this contribution, a custom-designed miniature PEM electrolysis cell is presented, fitting the spatial constraints of a 1H coil of a commercially available imaging probe. In contrast to tailor-made probes [2,3], this approach allows for a broader range of NMR experiments – including not only 1H spectroscopy and T1 and T2 relaxometry, but also the first MRI and diffusion measurements on operating PEM electrolysis cells. The key design feature was a sealing concept without screws, utilizing O-rings in combination with precise compression geometry. Uniform electrical contacting minimizing metal content in the NMR-sensitive volume was validated via microelectrode voltage mapping. The inlet water temperature was controlled between 60 and 80 °C using a non-magnetic heat tube.The functionality of the newly developed NMR cell is demonstrated by electrochemical and NMR experiments in the second part of the contribution. The 1H signal-to-noise ratio and resolution allowed chemical shift analysis, while T1/T2 contrast enabled differentiation between MEA and water signals. MRI revealed water and gas bubble distribution during operation. Impedance spectroscopy and cyclic voltammetry results were consistent with labscale PEM electrolysis.This novel in operando NMR cell provides an effective method for investigating degradation phenomena during long-term PEM electrolysis experiments, leveraging the wide variety of experiments available with commercial probes.
001046699 536__ $$0G:(DE-HGF)POF4-1232$$a1232 - Power-based Fuels and Chemicals (POF4-123)$$cPOF4-123$$fPOF IV$$x0
001046699 7001_ $$0P:(DE-Juel1)169518$$aJovanovic, Sven$$b1
001046699 7001_ $$0P:(DE-Juel1)187071$$aBorowec, Julian$$b2$$ufzj
001046699 7001_ $$0P:(DE-Juel1)156123$$aEichel, Rüdiger-A.$$b3$$ufzj
001046699 7001_ $$0P:(DE-Juel1)167581$$aHausen, Florian$$b4$$ufzj
001046699 7001_ $$0P:(DE-Juel1)162401$$aGranwehr, Josef$$b5$$eLast author$$ufzj
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001046699 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)162401$$aForschungszentrum Jülich$$b5$$kFZJ
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001046699 9141_ $$y2025
001046699 920__ $$lyes
001046699 9201_ $$0I:(DE-Juel1)IET-1-20110218$$kIET-1$$lGrundlagen der Elektrochemie$$x0
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