Abstract
Electrochemical characteristics of various half-cells, based on samaria and gadolinia doped ceria electrolytes and nano-micro-mesoporous La0.6Sr0.4CoO3-δ, Pr0.6Sr0.4CoO3-δ, Gd0.6Sr0.4CoO3-δ, 70 wt% La0.6Sr0.4CoO3-δ + 30 wt% Ce0.8Gd0.2O1.925 and 70 wt% La0.6Sr0.4Co0.8Fe0.2O3-δ + 30 wt% Ce0.8Gd0.2O1.925 cathodes, have been obtained by electrochemical impedance, cyclic voltammetry and chronoamperometry methods. The seeming activation energy Eact depends on the chemical composition of half-cell, specific surface area and pore size distribution inside the cathode. Eact decreases with increasing negative potential. More pronounced dependence of Eact on potential has been established for mixed cathodes. The transfer coefficient for the oxygen reduction reaction αc > 0.5 dependent on the half-cell studied has been obtained. Analysis of Nyquist and Bode plots indicates the complicated adsorptsion/absorption and mass transfer processes inside the porous material. Dependence of the ratio of limiting steps on cathode porosity and chemical composition as well as on the electrode potential and temperature applied was established.
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