# Fuel cell types

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## The alkaline fuel cell

### Properties and structure

The alkaline fuel cell (English Alkaline Fuel Cell (AFC) is a low temperature fuel cell. It works in the temperature range of approx. $20$ until $90° C$ and achieves efficiencies between $60$ until $70%$. The oxygen used as the oxidizing agent must also be very pure.

Potash lye (usually 30%) serves as the electrolyte in these cells. For example, platinum or Raney nickel is used as a catalyst in the graphite gas diffusion electrodes.

### Reaction

$2H2+4OH−→4H2O+4e−Anode reactionO2+2H2O+4e−→4OH−Cathodic reaction2H2+O2→2H2OOverall response$