Perovskite catalysts: Cyclic voltammograms in Ar- and O2-saturated KOH reveal that the onset for the oxygen reduction reaction (ORR) occurs at potentials below ∼0.77 VRHE. Rotating ring-disk electrode measurements and Koutecky–Levich analysis prove that for Ba0.5Sr0.5Co0.8Fe0.2O3-δ, the ORR does not fully proceed via a four-electron process, leading to the parallel formation of OH− and HO2− (see picture).
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