The hydrogen fuel cell is an electricity-generating device, powered by hydrogen (from a tank of some sort) and oxygen (taken from the atmosphere, unless you're on a spaceship, then that comes from a tank as well). It produces electricity on demand; i.e., when you press the accelerator in a fuel-cell ' car. As long as there is a supply of | hydrogen and oxygen, it will operate. It won't ao 'flat'. This is a bit double chemistry, but here goes. In the middle of the cell is something called a 'proton exchange membrane'. Hydrogen gas (H2) is forced through the cell from one side and a catalyst splits it into two hydrogen ions (positively charged) and two electrons (negative). QThe membrane is designed such that the ions can pass through it, but the electrons can't.
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