Photoelectrochemical Impedance Spectroscopy: I . Validation of the Transfer Function by Kramers‐Kronig Transformation

Abstract

The effects of the partial pressure of oxygen and temperature on the oxygen reduction on a submerged gold electrode in a lithium carbonate melt were investigated using cyclic voltammetry and impedance analysis. The values for the mass‐transfer parameters, , obtained from cyclic voltammetry and impedance analysis were in good agreement. The reaction orders for oxygen at 800°C were calculated to be about 0.3 for the exchange current density and 0.5 for the product; these values are consistent with the mechanism proposed in the literature for oxygen reduction in melt.