Conductivity of Gd-doped BaCeO3 protonic conductor in H2-H2O-O2 atmospheres

Abstract

This work proposes a radically new simple method of evaluation of the proton conductivity based on measurement of the conductivity of ceramic materials depending on the oxygen partial pressure (pO2) at a gradual transition from the atmosphere of pure oxygen to one of wet hydrogen: O2 → O2 (H2O) → H2o (O2) → H2o → H2o (H2) → H2 (H2O). Experimental data for the solid electrolyte BaCe0.9Gd0.1O3-δhave been fitted in accordance with the defect chemistry model. Experimental and theoretical relationships correlate well with each other, which indicate the success of the proposed model description. Analysis of the relationships allowed us to estimate the level of oxygen-ion, proton and electron components and their contribution to the overall conductivity at elevated temperature. Copyright © 2013 Delta Energy and Environment.