화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.164, No.14, F1543-F1550, 2017
Measurement of Ionic Conductivity and Electrode Polarization at Low Temperatures on 8YSZ by a DC Technique
Measurement of ionic conductivity and electrode polarization resistance on a 8YSZ sample with platinum paste electrodes was conducted using a DC method with high input impedance meters over a temperature range from 119 degrees C to 589 degrees C. Over the entire temperature range, the meter resistance was much larger than the sample resistance including the polarization resistance. At lower temperatures, a faraday cage was used to minimize noise. The measured polarization resistance was also verified using electrochemical impedance spectroscopy. Ionic conductivity of 8YSZ exhibited Arrhenius behavior with an activation energy of similar to 1.1 eV, in good agreement with the literature. In the low current regime, electrode kinetics could be described by the linearized form of the Butler-Volmer equation. At higher current densities, electrode kinetics exhibited Tafel behavior. The polarization resistance exhibited Arrhenius behavior with the activation energy ranging between 1.05 and 1.27 eV. The present work shows that electrode polarizations can be investigated using a DC method. The approach may allow study of different electrodes in various atmospheres using one sample. (c) 2017 The Electrochemical Society. All rights reserved.