Hydrogen Fuel Cell.

What is a Hydrogen Fuel cell and How does a Hydrogen fuel cell work?

A hydrogen fuel cell is a electrochemical device just like a battery. The device has chemicals stored inside it that is used to produce electric energy. In the case of a Battery these chemicals are acid. The chemicals inside a Hydrogen fuel cell that is used to produce electricity is Hydrogen and Oxygen.

In Electrolysis water (H₂O) is broken up into Oxygen(O) and Hydrogen(H) by running an electric current through it.

Now imagine the opposite.

In a Fuel cell Hydrogen and Oxygen is taken and converted in a chemical reaction to create water. In this chemical process an electrical current is produced. It is this electricity that is actually powering a Hydrogen fuel cell car.

This is a very simplified explanation to explain the very complex fuel cell effect.