Abstract
Prussian Blue deposited on the electrode surface under certain conditions is known to be a selective electrocatalyst of hydrogen peroxide (H 2O 2) reduction in the presence of O 2. The electrocatalyst was stabilized at cathodic potentials preventing its loss from the electrode surface. Hydrodynamic voltammograms of H 2O 2 reduction indicated the transfer of two electrons per catalytic cycle. The operational stability of Prussian Blue in H 2O 2 reduction was highly dependent on the buffer capacity of the supporting electrolyte. Since Prussian Blue is known to be dissolved in alkaline solution, it was confirmed that in neutral aqueous solutions the product of H 2O 2 electrocatalytic reduction is OH −.
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