Electrocatalysis of oxygen reduction on lanthanium-strontium manganate

By means of cyclic voltammetry and using a rotating disk electrode with a ring one investigated into the oxygen electrolytic reduction on (La0.5Sr0.5MnO3) lanthanium-strontium manganate in the alkaline medium. On the basis of the results obtained when using the disk electrode with a ring and on the basis of other kinetic parameters one made a conclusion that under the low overvoltage values the oxygen reduction proceeded through the mechanism of dissociation chemisorption. Under the high overvoltage values one observed how hydrogen peroxide formed on the electric catalyst (in HO2- alkaline medium). One determined the apparent current density of the oxygen electrolytic reduction exchange in the lanthanium-strontium manganate: 2x10-7 A cm-2; the Tafel inclination was equal to 100 mV per a current decade. Paper dwells upon the mechanism of oxygen electrolytic reduction on the mentioned oxide catalyst