A fuel cell has a simple structure includes three layers lying on each other. The first layer is the fuel electrode (positive), the second layer is the electrolyte Ionic conduction and the third layer is the oxygen electrode (cathode). The two electrodes are made of conductive substances (metal, graphite, ...). The electrolyte used as many different substances depending on the type of fuel cells, there kinds in solid, there kinds in liquid and membrane structure. Because a single cell only a very low voltage, so depending on the need to use many individual cells are connected to the next in each other, i.e. overlap. People often call a class overlap so is stack.In addition, the full system should have the auxiliary equipment such as compressors, pumps, to provide input, air-gas heat exchanger, check the system requirements, the certainty of the operation of machines, systems and fuel reserves.
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