Recognizing the Reactive Site of SnFe2O4 for the Oxygen Evolution Reaction: Synergistic Effect of SnII and FeIII in Stabilizing Reaction Intermediates

A combination of electro-kinetics and computational study establishes the synergetic effect of Sn( ii ) and Fe( iii ) sites on the SnFe 2 O 4 surface to promote hydroperoxo (*OOH) formation as the rate-limiting step of the oxygen evolution reaction.