The three layers of cathode, electrolyte and anode make up the membrane electrode assembly (MEA) of the proton exchange membrane (PEM) fuel cell. The electrolyte is a thin film, usually a sulfonated, perfluorinated polymer. The catalysed electrodes are porous carbon. The operating temperature is less than 100C.
Excellent animation video of PEM fuel cell operation!!
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Drawing showing how a stack of PEM cells work
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