In terms of fuel cell chemical reaction is the reverse of electrolysis. In the process of electrolysis of water is split into hydrogen and oxygen into electrical energy through. Primary energy cells taken two substances transforming them into water. Thereby, in theory, the power of the energy put into will be liberated, but actually because of the losses over the course of physical chemistry and earned less energy. The fuel cells have a common principle described based on PEM fuel cell (Proton Exchange Membrane - fuel cells with proton exchange membrane) as follows:
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