A Short Review of Material Combination in Bilayer Electrolyte of IT-SOFC.

The technology of solid oxide fuel cell (SOFC) is attractive as it is considered as one of promising clean energy due to its efficiency and clean production of electricity. However, high operating temperature of SOFC are main issue in range of applications such as in transportation and portable equipment. One of many goals of SOFC is to lower the operating temperature. Bi-layer electrolyte has become one of the solution in order to reduce the high operating temperature. This review article provides the preliminary information of bi-layer electrolyte in order to achieve high performance at intermediate temperature.

Fabrication of YSZ/SNDC Bilayer Electrolytes by Spark Plasma Sintering

Doped ceria has been reported as a promising candidate of electrolyte applicable for solid oxide fuel cells (SOFCs) and oxygen sensors due to its high ionic conductivity at intermediate temperature. However, it suffers from certain limitations including the existence of electronic conductivity at reduced atmosphere, which would thus increase the leakage current in cells, and the low fracture strength. In this work, we fabricated a bilayer electrolyte with samarium and neodymium co-doped ceria (SNDC) and yttrium stabilized zirconia (YSZ) using spark plasma sintering (SPS) method, which possess the advantages of two layers, high conductivity of SNDC and good electron blocking ability of YSZ. Both layers of the specimen we obtained were dense and well crystallized according to the scanning electron microscope (SEM) and X-ray diffraction (XRD). The bilayer electrolyte exhibits improved ionic conductivity than YSZ with the value of 1.7 S/cm at 550.