A completely slot die coated membrane electrode assembly. (15th March 2019)

• Record Type: Journal Article
• Authors: Stähler, Markus; Stähler, Andrea; Scheepers, Fabian; Carmo, Marcelo; Stolten, Detlef
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 14(2019)
• Page Start: 7053
• Page End: 7058
• Publication Date: 2019-03-15
• Subjects: PEM water electrolysis -- CC-MEA -- Completely slot die coated MEA -- Direct membrane deposition; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.02.016
• Languages: English
• ISSNs: 0360-3199

Abstract

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. Highlights: Manufacturing of completely slot die coated membrane electrode assemblies. A multilayer coating technique without the need to handle a separate membrane. High frequency resistances agree with published values of a competitive technique.