A fuel cell is like a battery that you can continuously refill with new chemicals to produce electricity, different to a battery that stores its chemicals.
It contains an anode and cathode like a battery, and also an electrolyte, with a catalyst to Oxidise the fuel, producing ions and electrons.
The ions pass through the electrolyte to the cathode, while the electrons move through an external circuit to the cathode, creating a current of electricity.
The most common fuel is hydrogen and oxygen which forms water as a byproduct.
Sir William Grove is thought to have made the first fuel cell in 1838, and different types of fuel cells are used today by NASA for its spacecraft.
Fuel cells have no moving parts, and can be used in both mobile and stationary applications, for example in powering forklifts and space shuttles.
