Fuel Cell Electrode Diagram
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A diagram of one electrode pair is shown
opposite. Hydrogen and oxygen are supplied
to the cell as molecular gases which are
dissociated by catalyst material on the electrodes.

At the Anode (negative electrode) hydrogen gas
is dissociated into two protons (H⁺) and two
electrons (e^_). The protons can travel through
the polymeric proton exchange membrane:
PEM (a solid electrolyte) and combine with
oxygen ions generated at the Cathode
(positive electrode) to form water.