During the last two decades the interest towards alternative solutions for the propulsion system of automotive vehicles has increasingly grown, in order to face the several environmental problems and the consequent increasingly stringent European regulation. One of the solutions that has been proposed and has risen the biggest scientific interest is the usage of hydrogen fuel cell (more precisely polymeric electrolyte membrane fuel cell, PEMFC). This solution has several advantages: PMEFCs are able to convert the chemical energy of the hydrogen into electrical energy exploiting the reverse principle of electrolysis, producing only water and heat, hence without pollutant emissions; PEMFCs can operate as long as there is hydrogen available in the tank, thus the fuel cell electric vehicles have less autonomy issues than battery electric vehicles; Hydrogen tank can be refilled in few minutes, unlike the battery electric vehicle that takes a lot of time to recharge the batteries.