Electrochemial Reaction Kinetics of Mixed Conducting Electrodes on CeO2-Based Solid Electrolytes

Porous and dense La 0.6 Sr 0.4 CoO 3−δ layers were prepared as working electrodes on 10 mole % CaO doped CeO 2 electrolytes. Electrochemical measurements were made as a function of oxygen partial pressure at 500 to 900°C. The electrode interface conductivity and the steady-state polarization curve suggested that the reaction rates with porous electrodes are controlled by gas diffusion process at low P(O 2 ) and those with dense electrodes by surface reaction.