Membrane Electrode Assemblies
The membrane electrode assembly (MEA) is the core component of a fuel cell. Membrane electrode assembly (MEA) is composed of polymer electrolyte membrane (PEM), catalyst layers (CL) and gas diffusion layers (GDL) attached on the outer surface of the catalyst layers as shown in the schematic drawing. There are two approaches to apply the catalyst layer for the MEA fabrication. One is the combination of the catalyst layer and the gas diffusion layer that forms an electrode. Another is coating catalyst layer on the surface of polymer electrolyte membrane (a polymer electrolyte membrane is sandwiched between two electrodes) which is also referred as catalyst-coated membranes (CCMs). The CCM is then sandwiched between 2 GDL’s.
A MEA made of electrodes and a polymer electrolyte membrane has 5-layer configuration and is known as a 5-layer MEA. A MEA available from a CCM configuration is referred to a 3-layer MEA. The 5-layer MEA is ready to be installed in a cell as an integrated component. The 3-layer CCM requires an attachment of a pair of GDL s making it a 5-layer configuration for installation. The GDL with carbon micro-porous layer (CMPL) has been typically used for this application.
Electrochemical reactions occur when a fuel and oxidant are applied to the anode and cathode side of the catalysts. The variables in MEA design include catalyst, loading, membrane, size, shape and type of GDL. Along with its standard MEA, ElectroChem offers a wide range of customizations.
Our line of MEAs is based on years of experience as well as our own proprietary manufacturing processes and quality control. We have developed a highly reliable product that is unmatched by others, which gives our customers the reliability they have come to expect.
ElectroChem’s standard MEA’s are based on following specifications:
Options for MEA Customization