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

The problem of calculating the limiting current in a redox system on a vert ical plane electrode under the natural convection conditions is solved. By way of example, the reaction of ferrocyanide oxidation on platinum in a sol ution containing a mixture of potassium ferrocyanide and ferricyanide tin e xcess). An equation for the effective Rayleigh number determining the limit ing current is derived by Karmin's method with allowance made for the migra tion current of an indifferent electrolyte. Limiting currents in the electr ochemical system under study are determined experimentally. The calculated and measured limiting currents are compared.