Economic Membrane Electrode Assembly (MEA, 3-7 Layers) for H2-O2 Proton-Exchange Membrane Fuel Cell, CHOPEMFCEMEA

A Membrane Electrode Assembly (MEA) is the "heart" of a hydrogen-oxygen (H2-O2) fuel cell, where the electrochemical reaction occurs to produce electricity, heat, and water. It is a multi-layered component that separates fuel from oxidant while allowing the passage of ions to complete the circuit.

A typical MEA is classified by its number of layers, with 5-layer and 3-layer configurations being the most common. (1) Polymer Electrolyte Membrane (PEM): The central layer, typically made of perfluorosulfonic acid (PFSA) like Nafion. It is thin (often under 20 um for transport) and conducts only positively charged protons while blocking electrons and reactant gases. (2) Catalyst Layers (CL): Applied to both sides of the membrane (Anode and Cathode). The anode side facilitates the Hydrogen Oxidation Reaction (HOR), splitting H2 into protons and electrons. The cathode side facilitates the Oxygen Reduction Reaction (ORR), where protons, electrons, and O2 combine to form water.Typically nanometer-sized Platinum (Pt) particles dispersed on high-surface-area carbon support and mixed with an ion-conducting polymer (ionomer). (3) Gas Diffusion Layers (GDL): Located outside the catalyst layers in a 5-layer MEA.Composed of porous carbon paper or cloth, often coated with a Microporous Layer (MPL) of carbon and PTFE.Functions include uniform gas distribution, electrical conduction, and managing water removal to prevent "flooding".