Abstract
Polarization resistance of the Ni-Zr0.84Y0.16O1.92 anode impregnated with cerium oxide in H2+H2O+CO+CO2+Ar gas mixtures of different composition was studied at temperatures of 700–950°C by means of EIS and subsequent DRT and NLLS analysis of EIS spectra. The electrochemical activity of the anode in the H2+H2O+CO+CO2+Ar was found to be defined basically by the hydrogen-containing components (H2 and H2O). The EIS spectra analysis revealed that the anode polarization resistance is determined by three processes, registered at high-, middle- and low-frequencies, respectively. The high-frequency resistance had an activation energy of about −0.93eV and it did not depend on the gas mixture composition. Both the middle-frequency resistance (activation energy of about −1.04eV) and the low-frequency resistance (0.31eV) depended on the gas atmosphere composition. Suggestions about the nature of the rate-determined steps were proposed.
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