Electric vehicles are in themselves environmentally clean. Generating clean electricty on demand within the vehicle from hydrogen fuel cells will provide a clean energy source for cars.
Polymer Electrolyte Membrane (PEM) fuel cells use a mixture of hydrogen and oxygen from the air to produce electricity.
The PEM has an anode plate on one side and a cathode plate on the other. Hydrogen is passed through the anode side which is seperated into positive hydrogen ions and negatively charged electrons.
The positive hydrogen ions are passed through to the cathode, whilst the negatively charged electrons are passed though a seperate circuit creating an electrical current.
The negatively charged electrons and the positively charged hydrogen ions combine to create water.
Each PEM creates a small voltage, it is the power of multiple fuel cells combined together to form a stack which generates the required electricity.