OXYGEN REDUCTION REACTION

"An electrode reaction in which oxygen gas is reduced at the cathode of an electrochemical cell. The product of the reduction can be hydroxyl (OH-) ions or water molecules (or occasionally hydrogen peroxide molecules). Abbreviated as ""orr."" It is the reverse reaction of oxygen evolution. It is a very important and much studied electrode reaction because it occurs at the cathode of practically all fuel cells and it occurs at the cathode of many (though not all) corrosion cells. "