GAS ELECTRODE

"Any electrode with one of the reactants or products in the gaseous phase. The solution surrounding the electrode is typically saturated with the gas. Essentially a redox electrode with the ""dissolved"" gas as one of the potential determining species. E.g., the oxidized species for the ""chlorine electrode"" is the dissolved chlorine gas, while the reduced species is the chloride ion in solution. Under equilibrium conditions, the chemical potential of the gaseous chlorine is the same as that of the dissolved chlorine. This may not be the case when current is flowing through the electrode: during the electrolytic production of chlorine, the solution may become supersaturated in chlorine if the nucleation of the gas bubbles requires considerable activation energy."