Dave, Bhasker B., Ralph E. White, Supramaniam Srinivasan, and John Appleby. 1993. “Impedance Analysis for Oxygen Reduction in a Lithium Carbonate Melt: Effects of Partial Pressure of Carbon Dioxide and Temperature”. Journal of The Electrochemical Society 140 (8): 2139-45.
Abstract
Effects of partial pressure of CO2 and temperature on O reduction kinetics on a Au electrode in a Li2CO3 melt were examined using electrochem. impedance spectroscopic (EIS) and linear sweep voltammetric techniques. The impedance spectra were analyzed by a complex nonlinear least squares method, using the Randles-Ershler equivalent circuit model, to determine the electrode-kinetic and the mass-transfer parameters, such as the charge-transfer resistance and the Warburg coefficient The cyclic voltammetric measurements indicated that the O reduction process in the Li2CO3 melt is reversible up to 200 mV/s. The D01/2C0 values determined by cyclic voltammetry agreed well with those estimated by the EIS method. The reaction. order with respect to CO2 and the activation energy for the exchange c.d. are -0.52 and 132 kJ/mol, resp. Also, the reaction. order with respect to CO2 and the activation energy for D01/2C0 were calculated to be -0.8 and 185 kJ/mol, resp.
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