Electrocatalytic reactions of nitric oxide on Prussian blue film modified electrodes

The electrocatalytic reduction and oxidation of nitric oxide on electrodes modified with Prussian blue (PB) films in acidic aqueous buffer solutions h as been studied. The cyclic voltammetry and spectroelectrochemistry results show that Prussian white, the reduced form of Prussian blue, acted as an e lectrocatalyst toward NO reduction. The reduction current started at - 0.4 V and became higher at more negative potentials. Bulk electrolysis of nitri te solution at PB-modified electrodes at - 0.7 V led to the formation of NH 3 and NH2OH. Berlin green, the oxidized form of PB, has the activity to cat alyze NO oxidation to yield nitrate at + 1. 3 V. The reactivity of PB is di scussed and the reaction schemes are presented. (C) 2001 Elsevier Science B .V. All rights reserved.