Abstract
Electrochemical characteristics of the semicells Ce 0.83 Gd 0.17 O 1.9 La 0.6 Sr 0.4 CoO 3-δ ; Ce 0.8 Sm 0.2 O 1.9 | La 0.6 Sr 0.4 CoO 3-δ and Ce 0.83 Gd 0.17 O 1.9 La 0.6 Sr 0.4 CoO 3-δ -Ag clusters have been studied by electrochemical impedance and chronoamperometric methods at various electrode polarisations ΔE and temperatures T. The polarisation resistance values, depending on ΔE and T, have been established from the electrochemical impedance data. The activation energy has been found to decrease slightly with the increase of |-ΔE|. The cathode reaction charge transfer coefficient α c ≃ 1.0 has been obtained from the Tafel-like overvoltage η c , logi-plots at T>823K, indicating the mass transfer limited process in the cathode material. The Z,Z'-plots have a complicated shape, and at least two time-constant values (two limiting stages) can be obtained. Thus, the kinetically mixed process, characterised by the slow transfer of electron to O ads and the diffusion-like step of O ads in the cathode material, is possible.
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