HIGH TEMPERATURE, IN SITU X-RAY ABSORPTION SPECTROSCOPY STUDY OF THE REDOX CHEMISTRY OF Sr2MgMoO6 SOLID OXIDE FUEL CELL ANODE MATERIALS

摘要

Increasing demands on a limited supply of fossil fuels have necessitated the need to find efficient and clean ways of utilizing these resources to produce electricity and power. Solid oxide fuel cells (SOFCs) have attracted considerable attention because of their ability to convert a wide variety of fuels (H2, CO, alcohols, syngas and other hydrocarbons) into products and electricity with efficiencies as high as 80% in combined heating a power applications.1 SOFCs require high operating temperatures (≥650˚C) in order to generate appreciable currents.2,3 In these environments, the complex carbon and sulfur chemistry of hydrocarbon fuels leads to deactivation and degradation of the typical Ni anode catalyst resulting in the eventual failure of the device.4 These limitations of SOFC technology have spurred the investigation of new mixed ionic and electronic conducting (MIEC) anode materials that can be effective at blocking carbon deposits and sulfur formations.5,6 Among the MIEC materials, those adopting a perovskite structure have shown the greatest potential for SOFC operation.5,6 The materials being discussed in these experiments will be the double perovskite, Sr2MgMoO6 (SMMO).