Migration of hydrogen ions in SrCeO3 studied by ERD analysis

The migration of hydrogen ions dissolved in SrCeO3 induced by an applied el ectric potential has been studied over the temperature range from 25 to 200 degrees C. It was found that the hydrogen ions migrated towards the cathod e, and they were trapped there when the cathode material had a good ability to getter the hydrogen. The amounts of hydrogen retained in the cathode co uld be determined by the ERDA technique using a high-energy He-4 beam. In o rder to estimate the proton transport number, defined as the ratio of the p rotonic conductivity to the total electric conductivity, we measured the am ount of hydrogen retained in the cathode as a function of electric charge n umber through the specimen. The protonic conductivity and the proton diffus ion coefficient were evaluated using the proton transport number and proton concentration in the specimen. (C) 1999 Elsevier Science B.V. All rights r eserved.