Selective Electrode Lamination for Swelling-Free Membrane Coating
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Solution Overview
Problem
Current methods for preparing membrane electrode assemblies face challenges in achieving precise and efficient coating of membranes, particularly in water electrolysis applications, due to the low viscosity of catalyst inks and membrane swelling, and have a significant environmental impact.
Innovation Solution
A process involving selective lamination of electrode materials onto a membrane using a stamp structure with embossing rollers, allowing for accurate alignment and transfer of catalyst layers onto the membrane, followed by peeling off the decal films, which enables precise and efficient coating while being environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spraying methods are used to apply catalyst ink onto the membrane, then the membrane can be coated with electrode material, but the low viscosity of the ink causes imprecise coating and the membrane swells due to solvent
Solution Approach 1:
The patent introduces a decal carrier foil as an intermediary substrate. The catalyst ink is applied onto this rigid foil rather than directly onto the membrane, preventing membrane swelling. The decal foil acts as a mediator that holds the catalyst layer during transfer, enabling precise positioning without solvent-induced membrane deformation
Solution Approach 2:
The catalyst ink is applied onto the decal carrier foil in advance, allowing the ink to dry and the catalyst layer to form completely before the membrane is introduced. This preliminary preparation on a stable substrate eliminates the swelling problem that would occur if ink were applied directly to the membrane
2Manufacturing precision
If selective coating is required in certain areas of the membrane surface, then application precision must be improved, but conventional methods lack the capability for precise area-selective coating
Solution Approach 1:
The patent segments the coating process into distinct stages: (1) applying ink to decal foil, (2) drying to form catalyst layer, (3) positioning decal over membrane, and (4) transferring catalyst to selected areas. This segmentation enables precise area-selective coating by controlling which portions of the decal contact the membrane during the transfer stage
Solution Approach 2:
The decal carrier foil serves as a positioning intermediary that allows the catalyst layer to be precisely aligned and transferred only to desired areas of the membrane. The rigid decal substrate enables accurate placement and selective contact, achieving area-selective coating that would be impossible with direct spraying methods
3Manufacturing precision
If decal processes are used to avoid solvent and improve precision, then coating accuracy improves, but the process efficiency and environmental impact need improvement
Solution Approach 1:
The patent merges multiple operations into a single integrated process: the decal carrier foil is prepared with catalyst ink, positioned over the membrane with precise alignment, and then heat-treated to simultaneously transfer the catalyst layer and bond it to the membrane. This combination of preparation, positioning, and transfer in one workflow improves efficiency while maintaining the precision benefits of decal processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process results in high-quality membrane electrode assemblies with improved efficiency and reduced environmental impact, allowing for cost-effective production of catalyst coated membranes suitable for both fuel cells and electrolysis applications.
Implementation Method 1
selective lamination of electrode materials on opposing sides of a membrane
Implementation Method 2
selectively laminating one or more portions of the stacked arrangement obtained in (4), thus selectively transferring first and second electrode materials
Data Source
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AI summary
The present invention relates to a process for the preparation of catalyst coated membranes comprising (1) providing a membrane film; (2) providing a first decal film of which one side is coated with a first electrode material; (3) providing a second decal film of which one side is coated with a second electrode material; (4) arranging the membrane film between the first and second decal films, such that the side of the first decal film with the coating of the first electrode material is brought into contact with one side of the membrane film, and the side of the second decal film with the coating of the second electrode material is brought into contact with the opposite side of the membrane film, thus obtaining a stacked arrangement of the membrane film between the first and second decal films; (5) selectively laminating one or more portions of the stacked arrangement obtained in (4), thus selectively transferring first and second electrode materials from the respective decal film to respectively opposite sides of the membrane film in said one or more portions, and obtaining a membrane film coated with first and second electrode materials on opposite sides thereof in said one or more portions which are selectively laminated; (6) peeling the first and second decal films off of the membrane film coated with first and second electrode materials in one or more portions thereof as obtained in (5). Furthermore, the present invention relates to a catalyst coated membrane obtained according to the inventive process as well as to its use for electrolysis or as a fuel cell.