A completely slot die coated membrane electrode assembly |
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| Affiliation: | 1. University of Liège, Department of Chemical Engineering – Nanomaterials, Catalysis, Electrochemistry (NCE), building B6a, Quartier Agora, Allée du six Août 11, 4000 Liège, Belgium;2. Université libre de Bruxelles, Transferts, Interfaces et Procédés (TIPs), Avenue F.D. Roosevelt 50, 1050 Brussels, Belgium;1. IMTEK, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;2. FIT, University of Freiburg, Georges-Koehler-Allee 105, 79110 Freiburg, Germany;3. Hahn-Schickard, Georges-Koehler-Allee 103, 79110Freiburg, Germany;4. Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby V5A-1S6, Canada |
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| Abstract: | This work shows how to manufacture completely coated membrane electrode assemblies (CC-MEAs) for PEM water electrolysis by only using a slot die. Platinum, Nafion®, and IrO2 dispersions are successively coated to the respective dried layer. For comparison reasons, MEAs with the same Iridium loading of 2.1 mg cm−2 and Platinum loading of 0.4 mg cm−2, assembled with a commercial membrane of the same 20 μm thickness, were produced via decal method. Differences in polarization curves are attributed to the lower high frequency resistance of CC-MEAs determined by impedance spectroscopy. The easy-to-scale CC-MEA method presented here offers the advantages of direct membrane deposition (DMD) without the challenge of homogenously coating a porous transport layer (PTL). Therefore, it allows a free choice of different PTLs – regardless if in sintered form or as expanded metal. The comparability between the produced CC-MEAs and published DMD results is shown by means of cross-sectional and electrochemical measurements. |
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| Keywords: | PEM water electrolysis CC-MEA Completely slot die coated MEA Direct membrane deposition |
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