Source: wikibot/oxygen-reduction-reaction
= Oxygen reduction reaction
{wiki=Oxygen_reduction_reaction}
The oxygen reduction reaction (ORR) is a key electrochemical reaction that involves the reduction of molecular oxygen (O₂) to water (H₂O) or hydroxide ions (OH⁻) in an electrochemical cell. This reaction is crucial in various applications, particularly in fuel cells, batteries, and corrosion processes. In the context of fuel cells, the ORR occurs at the cathode, where oxygen from the air is reduced.