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In redox reactions, electrons migrate from a donor to a receiver. In the fuel cell and in electrolysis, the donor and acceptor are separated from each other, so oxidation and reduction take place in different places. This makes it possible to use the flow of electrons as a current or to drive the reaction with an external voltage. Material for school: Techmax 16: Fuel cell https://www.max-wissen.de/max-hefte/t...