Abstract
This paper reports on the study of the electrochemical behavior of porous Bi3Ru3O11 – 40 wt% Bi1.6Er0.4O3 electrodes on a Bi2O3 – 10 wt% Bi24B2O39 electrolyte in a symmetric cell configuration by impedance spectroscopy. The dependence of the area specific resistance (ASR) for electrode polarization on the partial pressure of oxygen replaced from PO2−1/2 to PO2−3/4 with decreasing thickness of the layer, which inhibited wetting. This indicates a change in the rate-limiting oxidation-reduction reactions of oxygen. It is assumed that the dissociation of adsorbed oxygen molecules on the active catalytic centers of the triple phase boundary (TPB) is the limiting stage of a surface oxygen exchange, and with a decrease in the layer thickness, additional difficulty in the transfer of gaseous oxygen molecules from the gas phase to these active catalytic centers is observed.
Published Version
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