Sensors based on solid oxide electrolytes

Abstract The present chapter is devoted to electrochemical sensors based on high-temperature ion-conducting ceramic materials. Applications of such sensors for the determination of the concentration of gaseous components (hydrogen, carbon monoxide, carbon dioxide, steam, ammonia, hydrogen sulfide, simple hydrocarbons, etc.) in gas mixtures are described and discussed. Application of solid-electrolyte sensors for the detection of such gases as oxygen and hydrogen dissolved in melts (in a wide range of temperatures from 200°C to 1700°C) is also discussed. Special attention is dedicated to the analysis of experimental data already appeared in international literature and their adequacy to the basic operation principles. On the base of this analysis the advantages and problems of the sensors are revealed and discussed.