Fundamental analysis on a thermocell with a mixture of the soluble redox couple aqueous potassium ferrocyanide and potassium ferricyanide solution

Abstract

The transport coefficients in the flux equations of two soluble salts of the redox couple, the electric current and the heat in a thermocell were generally determined with the specific conductivity of the electrolyte solution, the transport numbers of the ions, the charge numbers of the ions, the heats of transfer of the salts and the steady-state thermoelectric power. The heats of transfer of potassium ferrocyanide and potassium ferricyanide in aqueous solution (0.36 mol dm 3 + 0.36 mol dm 3 ) were calculated as 8.0 and −1.2 kJ mol , respectively, at 298 K from measurement results of the initial and steady-state thermoelectric powers of the thermocell of the redox couple and the critical concentration of natural convection in a thin-layer thermocell placed horizontally.