Study of Undoped and Doped Vanadium Oxides for Application In Solid Oxide Fuel Cell SOFC

Abstract

The present thesis describes the synthesis of V2-xMxO5-and#948; (M=Li2O, MgO, Al2O3 and TiO2 (x=0.05, 0.10, 0.15, 0.20, 0.25, 0.30) systems by melt-quench technique. The physical, structural, optical, thermal and conducting properties of the prepared samples are studied using various experimental techniques to determine their suitability as an electrolyte for IT-SOFC applications. Based on above properties, some selected samples are used for interaction study with interconnect materials, which is being used in solid oxide fuel cells. The research work carried out for Ph. D. thesis is divided into six chapters along with a list of cited references at the end of each chapter. and#61558; Chapter 1 describes the background and introduction of various fuel cells particularly SOFCs. The role of different components of solid oxide fuel cell has been discussed. Since the present work is related to develop electrolyte materials, therefore, the main focus has been given on the electrolyte materials of SOFCs. The suitability of materials as electrolyte is described in context to specific properties such as thermal stability at fuel cell operating temperature in oxidizing and reducing medium and electrical conductivity. The present study reveals that the development of newer electrolyte materials with high conductivity at a lower temperature and thermal stability is required. and#61558; Chapter 2 deals with the literature survey and gives an idea about the composition- based structure-properties of vanadium and others materials. The effect of various dopants on the different properties of V2O5 synthesized by various experimental techniques has been studied. From the literature survey it can be concluded that the ionic conductivity and thermal stability is great concerned at high operating temperature of solid oxide fuel cell (SOFC) in oxidizing and reducing medium.