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With a new approach,the general current expressions of two typical second ordercatalytic reactions are obtained for disk,hemispherical and spherical microelectrodes understeady-state conditions.This approach is based on the concept of reaction layer.For thesecond order EC’ reactions,we also discussed how it is possible to observe pseudo-first orderor second order behavior.This consideration allows the study of the fast chemical reactionsand systems where the bulk concentrations of the reactants are nearly equal.Regenerationof Fe~(3+)(EDTA) with H_2O_2 was selected as an example of a rapid catalytic reaction.