Author(s)

E. YU. PIKALOVA, A.A. KOLCHUGIN & V.G. BAMBUROV

Abstract

This paper describes the experimental studies of multi-component solid state electrolytes based on CeO₂ and their application in intermediate temperature electrochemical devices. Two important aspects are emphasized: the effect of different dopants’ ionic radius and concentration on the electrical properties of CeO₂-based solid solutions in air and the influence of combined dopants on the electrolytic properties of solid electrolytes from the standpoint of the critical oxygen partial pressure pO₂ at which point the values of the electronic and ionic components of conductivity are equal. Examples of usage of the developed multi-component Ce_0.8(Sm_0.75Sr_0.2Ba_0.05)_0.2O_2-δ  electrolyte synthesized by solid state, laser evaporation and combustion methods and composites on the base of Ce_0.8(Sm_0.8Sr_0.2)_0.2O_2−δ  electrolyte as a component of electrochemical devices such as solid oxide fuel cell, gas sensors and as a component of the mixed ionic and electronic conducting (MIEC) membranes for hydrogen and syngas gas production are cited.

Keywords

CeO2, electrolytic domain boundary, energy production, hydrogen production, MIEC membranes, oxygen conductivity, potentiometric gas sensor, SOFC, solid-state electrolytes