Silver‐Based Supportless Membrane Electrode Assemblies for Electrochemical CO 2 Reduction

Most commonly, electrochemical CO 2 reduction is performed in a three‐compartment setup employing gas diffusion electrodes (GDEs) to decrease mass transport limitations of the gaseous reactant CO 2 to the reaction interface. However recently, there has been a rising number of investigations on suita...

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Veröffentlicht in:Electrochemical science advances 2024-12
Hauptverfasser: Weseler, Lydia, Löffelholz, Marco, Osiewacz, Jens, Turek, Thomas
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Turek, Thomas
description Most commonly, electrochemical CO 2 reduction is performed in a three‐compartment setup employing gas diffusion electrodes (GDEs) to decrease mass transport limitations of the gaseous reactant CO 2 to the reaction interface. However recently, there has been a rising number of investigations on suitable membrane electrode assemblies (MEAs) to overcome ohmic potential losses caused by the electrolyte gaps in the systems. While the significant majority of MEAs exhibited in literature is based on catalyst‐coated gas diffusion layers, this work presents an approach that does not require a likewise support. On the basis of a catalyst suspension similar to mixtures already employed for GDE production on industrial level, a method to directly transfer the resulting catalyst layers to the membrane is developed. The Faradaic efficiency of carbon monoxide, i.e. target product formation of GDEs manufactured according to a similar procedure, can be matched or even exceeded for individual modifications of the exchange MEAs. Simultaneously, the cell potentials can be remarkably decreased in this setup. By gradual adaptation of the fabrication procedure, the influence of important manufacturing parameters is unraveled, also discussing the effect of hydrogen permeation through the membrane.
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title Silver‐Based Supportless Membrane Electrode Assemblies for Electrochemical CO 2 Reduction
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