Synthesis and Characterization of CeO 2 doped with Sm 2 O 3 and Eu 2 O 3 for the use in SOFCs
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.430
Synthesis and Characterization of CeO2 doped with Sm2O3 and Eu2O3 for the use in SOFCs Alena Borisovna Kharissova1, Moisés Hinojosa Rivera1, Oxana V. Kharissova2 1
FIME, 2FCFM Universidad Autónoma de Nuevo León, Monterrey, México UANL
ABSTRACT
To free ourselves from the use of fossil fuels that are highly polluting, life-threatening and not easily regenerated, new technologies are being developed to obtain alternative energy sources more efficiently. Among these technologies, there is the option to improve the performance of solid oxide fuel cells (SOFCs) to make them highly energy efficient. Solid oxide fuel cells (SOFCs) have attracted much attention because they are environmentally benign, sustainable, generate low emissions and have relative low cost. However, conventional SOFCs with yttria-stabilized zirconia (YSZ) electrolyte require high operating temperatures (800-1000°C), which often lead to material degradation problems. Given that the greatest disadvantage of SOFCs is their high operating temperature, samples of CeO 2 were synthesized by spray pyrolysis method and doped with Sm2O3 and Eu2O3 to improve the ionic conductivity of the electrolyte so that it can operate at lower temperatures without losing its efficiency. The samples were analyzed using SEM, EDS, TEM. Further research will be made by small angle DRX, AFM, EIS and a prototype will be built to test the working temperature of the electrolyte.
INTRODUCTION Solid oxide fuel cells (SOFCs) are considered an efficient, environmentally friendly, and fuel-flexible power generation system. [1] SOFCs are characterized by having a solid ceramic electrolyte (a metallic oxide). Conventional SOFCs (they function with air and a fuel, usually hydrogen, to produce energy and produces water as a byproduct with yttria-stabilized zirconia (YSZ) electrolyte require high operation temperature (800-1000°C) for ionic conductivity to occur, which is not desirable due to degradation problems. Therefore, numerous efforts have been made to lower the operating temperature of SOFCs. To achieve this, special interest is drawn to cerium oxide and rare earth oxides (generally La2O3, Y2O3, Sm2O3, Gd2O3, Na2O, CaO, SrO are used as dopant material as oxygen ion conductivity in pure ceria is low. [2]) Conductivity depends on technological parameters, composition and microstructure of ceria [3]. The discovery of new electrolytes for low-temperature SOFCs (LTSOFCs) is still a grand challenge for the SOFC community. SOFCs are a great method to generate electrical energy, and they have several advantages over other conventional energy generation methods: SOFCs produce only water as a by-product, they are highly efficient for energy generation, are durable,
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