Enhancing the ionic conductivity in the ceria-based electrolytes for intermediate temperature solid oxide fuel cells

Abstract This chapter explains the emerging trends and development of cerium oxide–based material as a potential solid electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) application. The new strategies and approaches toward the enhancement in the ionic conductivity of the solid electrolyte in the current literature are discussed. The influence of structural and microstructural modifications on electrical properties of the solid electrolyte has been explained from the fundamental material aspect of IT-SOFCs. The various contributing factors for ionic transport such as grain and grain boundary effect in the bulk nanostructures are described. In addition, the importance of the oxide ionic conductivity to reduce the operational temperature of SOFCs is highlighted. The ongoing research in the development and requirements of thin layer of electrolytes using both chemical and physical methods are illustrated. This chapter highlights on the key development of interlayers which can be used in conjunction with doped ceria electrolytes for IT-SOFCs. The work also reviews the recent progress, advancements, and future directions in the ceria-based electrolytes for IT-SOFCs.