Limiting current in a redox system on a vertical electrode under conditions of natural convection

Abstract

The problem of calculating the limiting current in a redox system on a vertical plane electrode under the natural convection conditions is solved. By way of example, the reaction of ferrocyanide oxidation on platinum in a solution containing a mixture of potassium ferrocyanide and ferricyanide (in excess). An equation for the effective Rayleigh number determining the limiting current is derived by Karman’s method with allowance made for the migration current of an indifferent electrolyte. Limiting currents in the electrochemical system under study are determined experimentally. The calculated and measured limiting currents are compared.