Abstract
The paper illustrates the electrode kinetics studies results on Ni - Ce0.8Sm0.2O2-δ (Ni-SDC) anodes in a wet hydrogen atmosphere in the temperature range of 600–850°С by the electrochemical impedance spectroscopy before and after ceria addition to the anode. The addition of ceria to the anode by the solution impregnation technique is shown to result in the anode electrochemical activity growth by 10–24 times. An approach to the analysis of the impedance spectra based on the combination of the distribution of relaxation times method (DRT) and non-linear least squares method was verified. Based on data obtained from DRT functions, we found that the Ni-SDC anode reaction rate was limited by three processes, whereas the ceria-impregnated Ni-SDC anode electrode reaction rate was limited by two processes. The correlation of the DRT functions of both anodes demonstrated unambiguously that ceria addition to the Ni-SDC anode caused a significant decrease in the middle-frequency step of the electrode reaction, while the resistances of the other electrode reaction steps decreased less. Highly disperse ceria addition to the Ni-SDC anode was assumed to increase significantly the rate of reactions on the anode surface between the adsorbed species.
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