What happens to hydrogen at the anode in a fuel cell?

In a fuel cell, hydrogen acts as the fuel and is oxidized at the anode. When hydrogen gas is supplied to the anode, it loses electrons, a process known as oxidation. The loss of electrons from hydrogen atoms leads to the formation of hydrogen ions (protons). This process is essential for the operation of the fuel cell, as the electrons that are released flow through an external circuit, providing electrical energy. Meanwhile, the protons move through the electrolyte to the cathode, where they will eventually combine with oxygen to form water as a byproduct.

The correct answer reflects this fundamental characteristic of fuel cell chemistry, demonstrating the role of hydrogen in generating electricity through its oxidation at the anode.