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The inside of the PEFC is divided into separators, GDLs (gas diffusion layer), catalyst layers, and an electrolyte membrane.
A fuel cell is composed of a fuel electrode in which hydrogen ion (proton) is produced, an electrolyte in which proton moves, and an air electrode in which the air reacts.
In a cell, two electrodes, one of which is called the fuel electrode and the other the air electrode, sandwich the electrolyte (polymer electrolyte membrane).
The separators are placed so that they sandwich the cell. They are made up of electrically conductive carbon or similar plates. Fine grooves are cut in their surfaces to allow hydrogen or air to pass and be supplied to the electrodes.
A cell stack is composed of single cells stacked on one another. Connecting them in series allows a high voltage and large power to be extracted.