| ||
|
A simple principle with maximal efficiency.
This is how the PEM fuel cell works.
The PEM fuel cell is constructed like a sandwich. In the middle, there is a thin plastic foil, the »Proton Exchange Membrane« or PEM. This membrane is coated on both sides with a thin catalyst layer and a gas-permeable electrode.
The membrane is surrounded by two so-called bipolar plates which have been provided with gas channels. On one side, hydrogen flows through the gas channels, on the other side oxygen.
The catalyst splits the hydrogen atoms into protons and electrons. Unlike the electrons, the protons can cross the membrane. This way, a voltage potential builds up between the two electrodes. If the two electrodes are connected, direct current flows. In addition, water and heat are created as reaction products.
